469 lines
11 KiB
Plaintext
469 lines
11 KiB
Plaintext
%rec: command
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%doc: shell command examples
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%type: aim line
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%allowed: aim cmd bin tag note shell
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%unique: shell
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aim: Put output into columns
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cmd: ip a | grep inet | column -ts' '
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shell: sh
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bin: column
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tag: format
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aim: Reformat file with an explicit separator (`-s`)
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cmd: column -ts: /etc/passwd
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shell: sh
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bin: column
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tag: format
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aim: Sort lines into columns with names
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cmd: column -ts: -N User,PW,UID,GID,Description,Home,shell -H PW,GID /etc/passwd
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note: Hide some columns with `-H`.
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shell: sh
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bin: column
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tag: format
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aim: Sort lines into columns and reorder them
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cmd: column -ts: -N User,PW,UID,GID,Description,Home,shell -H PW,GID -O User,Description,shell /etc/passwd
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note: Unspecified items remain.
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shell: sh
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bin: column
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tag: format
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aim: Output to json format with `-J`
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cmd: column -J -ts: -H PW,GID,shell -N User,PW,UID,GID,Description,Home,shell /etc/passwd
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shell: sh
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bin: column
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tag: format
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tag: json
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aim: Make a QR Code image
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cmd: qrencode 'https://play.google.com/store/apps/details?id=org.briarproject.briar.android' -o "${file}".png
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shell: sh
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bin: qrencode
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tag: qr
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aim: Make a QR Coded message in the terminal
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cmd: qrencode -t ansi "Hello World"
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shell: sh
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bin: qrencode
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tag: qr
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aim: Read a QR Code image
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cmd: zbarimg ${file}
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shell: sh
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bin: qrencode
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tag: qr
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aim: Show wifi QR code (only with Network Manager)
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cmd: nmcli device wifi show-password
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shell: sh
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bin: qrencode
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bin: nmcli
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tag: qr
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tag: wifi
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aim: Combine many recfiles of different types into one
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cmd: sed '1i\ ' *.rec > all.rec
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shell: sh
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bin: sed
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tag: recfiles
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tag: database
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aim: Combine many recfiles of the same type into one
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cmd: recinf -d -t ${type} ${one}.rec > ${all}.rec
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+ sed '/^%/d' ${one}.rec ${two}.rec > all.rec
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note: The strange syntax used by `sed` only makes sense after using [ed](writing/ed.md)
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shell: sh
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bin: sed
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bin: recinf
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tag: recfiles
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tag: database
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aim: Roll a die
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cmd: echo $(( RANDOM % 6+1 ))
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shell: bash
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tag: random
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aim: Remotely edit a file with vim
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cmd: vim scp://${server}/~/${file}
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cmd: vim scp://${user}@${server}:${port}//${path}/${file}
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shell: sh
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bin: vim
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bin: scp
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tag: network
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aim: Find and replace across all files open in vim
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cmd: :bufdo! %s/${pattern}/${replacement}/g
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shell: sh
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bin: vim
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tag: writing
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tag: replace
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aim: Find and replace words, but confirm each replacement
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cmd: vim -c "%s/${pattern}/${replacement}/gc" -c 'wq' ${file}
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shell: sh
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bin: vim
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tag: replace
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tag: substitution
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tag: TUI
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tag: writing
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aim: Hard reset ntp service
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cmd: sudo ntpd -q -g -x -n
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bin: ntpd
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tag: time
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tag: system
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aim: Check a service
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cmd: sudo systemctl status mpd
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shell: sh
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bin: systemd
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tag: system
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tag: service
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aim: Recognize service changes
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cmd: sudo systemctl daemon-reload
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shell: sh
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bin: systemd
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tag: system
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tag: service
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aim: Start a service (it stops when the computer shuts down)
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cmd: sudo systemctl taskd.service start
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+ sudo systemctl daemon-reload
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shell: sh
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bin: systemd
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tag: system
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tag: service
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aim: Find out why the computer takes so long to start
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cmd: sudo systemd-analyze
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+ sudo systemd-analyze blame
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shell: sh
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bin: systemd
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tag: system
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tag: boot
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aim: See what the computer is doing
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cmd: journalctl -f
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shell: sh
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bin: journalctl
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tag: system
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aim: Check your own user services:
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cmd: journalctl -f
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shell: sh
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bin: journalctl
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tag: system
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aim: Follow the `ssh` daemon service
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cmd: journalctl -f -u sshd
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shell: sh
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bin: journalctl
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tag: system
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aim: Find errors since a date
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cmd: date=2027-01-01
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+ journalctl --since=${date} --grep="EXT4-fs error"
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shell: sh
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bin: journalctl
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tag: system
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aim: Limit the journal's size to 2 gigabytes
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cmd: journalctl --vacuum-size=2G
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shell: sh
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bin: journalctl
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tag: system
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aim: Log the fact that you've installed your own `dnsmasq` on your system to `journalctl`, so that you can determine why your system's broken later
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cmd: logger "Installed new dnsmasq"
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+ sudo journalctl -f
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shell: sh
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bin: journalctl
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tag: system
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aim: Convert markdown table to csv
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cmd: mlr --imarkdown --ocsv cat ${file}.md
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bin: mlr
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tag: csv
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tag: markdown
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tag: data
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aim: Convert a csv file to markdown
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cmd: mlr --icsv --omd cat ${file}.csv
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bin: mlr
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tag: csv
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tag: markdown
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aim: Quickly find and open run-command files
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cmd: alias rrc='$PAGER "$(find . -maxdepth 2 -name "*rc" | fzf)"'
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bin: fzf
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bin: find
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tag: comfy
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aim: Quickly hunt and kill processes
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cmd: kill $(pgrep less | fzf -m --preview='ps {}')
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note: Select many with shift/tab.
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bin: fzf
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tag: comfy
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aim: Search for a short word
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cmd: grep "\b${word}\b" ${file}
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bin: grep
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tag: search
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aim: Extract words in quotes
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cmd: grep -o "\b${word}\b" ${file}
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bin: grep
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tag: search
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aim: Reformat variable for shell input
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cmd: printf "%q\n" "${variable}"
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bin: printf
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tag: xargs
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tag: stdout
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aim: Find your public IP address
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cmd: dig +short myip.opendns.com @resolver$((RANDOM % 4 + 1)).opendns.com
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shell: bash
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bin: dig
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tag: ip
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tag: network
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aim: Turn markdown into a man page
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cmd: man <(lowdown -stman ${file}.md)
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cmd: top_title="Bugs in netcat"
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+ someplace=LK
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+ vol=Security
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+ sec=6
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+ lowdown -m manheader="${top_title}" -m source="${someplace}" -m volume="${vol}" -m section=${sec} -stman ${file}.md > ${file}.${sec}
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+ man ./${file}.${sec}
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shell: bash
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bin: lowdown
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bin: groff
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bin: man
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tag: markdown
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aim: Convert jpg to png
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cmd: magick ${input}.jpg ${output}.png
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bin: magick
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tag: vision
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aim: Reduce jpg size by reducing quality
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cmd: quality=70
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+ magick ${input}.jpg -quality ${quality} ${output}.jpg
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cmd: size=50
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+ magick -resize ${size}% ${input}.jpg ${output}.jpg
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bin: magick
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tag: vision
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aim: Reduce png size
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cmd: magick ${input}.png png8:${output}.png
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bin: magick
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tag: vision
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aim: Invert jpg colours
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cmd: magick ${input}.jpg ${output}.jpg -negate
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bin: magick
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tag: vision
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aim: Make jpg smaller
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cmd: magick ${input}.jpg -resize 25% ${output}.jpg
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bin: magick
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tag: vision
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aim: Trim images to border
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cmd: magick -trim ${image}.png ${output}.png
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bin: magick
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tag: vision
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aim: Make the white of an image transparent
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cmd: magick -transparent white -fuzz 10% ${input}.png ${output}.png
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bin: magick
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tag: vision
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note: The 'fuzz' option tells the computer that 'close to white' is fine. You might want to use 20% or higher fuzz.
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aim: Give transparrent image a dropshadow
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cmd: magick ${input}.png \( +clone -background black -shadow 50x8+0+5 \) +swap -background none -layers merge +repage ${output}.png
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bin: magick
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tag: vision
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aim: Convert every jpg in directory to png
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cmd: mogrify -format png *.jpg
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bin: magick
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tag: vision
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aim: Convert from jpg to svg
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cmd: magick -flatten ${input}.jpg ${output}.ppm
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+ potrace -s ${output}.ppm -o ${svgout}.svg
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bin: magick
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tag: vision
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aim: Make an image showing day of the week
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cmd: magick -list font
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+ font="$(magick -list font | grep -oP 'Font: \K.*' | head -1)"
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+
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+ magick -fill blue -font "${font}" -gravity center -pointsize 79 label:$(date +%A) day.png
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bin: magick
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tag: vision
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aim: Make a meme
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cmd: magick ${input} -font impact -fill white -pointsize 84 -stroke black -strokewidth 3 -gravity north -annotate +0+20 'TOP MEME TEXT' -gravity south -annotate +0+20 'BOTTOM MEME TEXT' ${output}
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bin: magick
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tag: vision
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tag: memes
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aim: Rotate a video
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cmd: ffmpeg -i "${input}" -vf "transpose=1" "${out.mov}"
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note:
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+ | No. | Degrees | Flip |
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+ |:---:|:-------:|:---------------------------------------|
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+ | 0 | 90 Counterclockwise and verfical flip (default) |
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+ | 1 | 90 Clockwise |
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+ | 2 | 90 CounterClockwise |
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+ | 3 | 90Clockwise and vertical flip |
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tag: vision
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tag: video
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shell: sh
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aim: Translate a media file to a new type
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cmd: ffmpeg -formats
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+ ffmpeg -i ${input} ${output}
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bin: ffmpeg
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tag: vision
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tag: music
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tag: video
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shell: sh
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aim: Reduce video quality
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cmd: quality=20
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+ ffmpeg -i ${input}.mp4 -vcodec libx264 -crf ${quality} ${output}.mp4
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note: A crf quality of 18 is high, while 24 is low quality.
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bin: ffmpeg
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tag: vision
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tag: video
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shell: sh
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aim: Convert from mkv to mp4 with a codec
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cmd: ffmpeg -i ${input}.mkv -codec copy ${output}.mp4
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note: Both mp4 and mkv are wrappers around other formats, so this conversion loses less quality than other conversion types.
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bin: ffmpeg
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tag: vision
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tag: video
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shell: sh
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aim: Convert video to audio
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cmd: ffmpeg -i ${input}.mp4 -vn ${output}.mp3
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bin: ffmpeg
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tag: vision
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tag: video
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shell: sh
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aim: Convert all mkv files to mp4
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cmd: for i in *.mkv; do
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+ ffmpeg -i "$i" -codec copy "${i%.*}.mp4"
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+ done
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bin: ffmpeg
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tag: vision
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shell: sh
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aim: Change resolution
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cmd: ffmpeg -i ${input}.mp4 -filter:v scale=1280:720 -c:a copy ${output}.mp4
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bin: ffmpeg
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tag: vision
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shell: sh
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aim: Change video aspect ratio
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cmd: ffmpeg -i input.mp4 -aspect 16:9 output.mp4
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bin: ffmpeg
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tag: vision
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tag: video
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shell: sh
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aim: Trim video to start and stop times
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cmd: start=00:00:50
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+ stop=50
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+ ffmpeg -i ${input}.mp4 -ss ${start} -codec copy -t ${stop} ${output}.mp4
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note: The `$stop` time shows how many seconds after the start you want.
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bin: ffmpeg
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tag: vision
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shell: sh
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aim: Compress a video file
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cmd: quality=21
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+ ffmpeg -i ${input}.mp4 -vf scale=1280:-1 -c:v libx264 -preset veryslow -crf ${quality} ${output}.mp4
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note: A crf quality of 18 is high, while 24 is low quality.
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bin: ffmpeg
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tag: vision
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tag: video
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shell: sh
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aim: Convert video to a series of images
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cmd: framerate=1
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+ format=image2
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+ ffmpeg -i input.mp4 -r ${framerate} -f ${format} image-%2d.png
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bin: ffmpeg
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tag: vision
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shell: sh
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aim: Add subtitles to a video file
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cmd: fmpeg -i ${input}.mp4 -i subtitle.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast ${output}.mp4
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bin: ffmpeg
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tag: vision
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shell: sh
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aim: Convert a web page to markdown
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cmd: curl -sL "${url}" | html2markdown > "${file}}".md
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cmd: curl -sL "${url}" | html2text > "${file}}".md
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note: The `[html2markdown](https://github.com/JohannesKaufmann/html-to-markdown)` and `html2md` programs works better than any other.
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bin: html2markdown
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bin: curl
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tag: writing
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tag: web
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shell: sh
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aim: Decode a URL with function
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cmd: urldecode() { echo -e "${@//%/\\x}"; }
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+ urldecode "${magnet}"
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tag: web
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shell: bash
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aim: Request a definition from the terminal.
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cmd: word='abderian'
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+ curl -s dict://dict.org/define:${word}:
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cmd: function wotsa(){
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+ def="$(curl -s dict://dict.org/define:${1// /+}: | grep -vP '^\d\d\d ')"
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+ if [ "$def" = "" ]; then
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+ echo no definition
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+ else
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+ echo "$def" | $PAGER
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+ fi
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+ }
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bin: curl
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tag: writing
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tag: comfy
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tag: dict
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shell: sh
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aim: Email a pull request which points to your git server
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tag: git
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bin: git
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tag: email
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tag: pr
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cmd: repo=ssh://soft.dmz.rs:2222/mkdots/
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+ theirHead='HEAD^^^^'
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+ head=master
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+ git request-pull "${theirHead}" "${repo}" "${head}"
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note: You can note where your branch diverged from theirs with a commit hash,
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+ or a relative position, like `HEAD^^` (e.g. 'two commits before your latest').
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aim: Clean up a bloated git repo
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cmd: git fsck --full
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+ git gc --prune=now --aggressive
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+ git repack
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bin: git
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tag: maintenance
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shell: sh
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