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5a1ba18176
...
92d14e41b5
@ -1,12 +0,0 @@
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---
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title: "Joyous ASCII"
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tags: [ "fun" ]
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---
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- `asciiquarium`
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- `cbonsai -lim "$(fortune)"`
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```bash
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cow=$(cowsay -l | sort -R | head -1)
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fortune -s | figlet | cowsay -nf $cow | lolcat
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```
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114
basics/cron.md
114
basics/cron.md
@ -2,11 +2,9 @@
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title: "cron"
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tags: [ "Documentation", "Basics" ]
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---
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# Cronie
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# Cron
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The `cronie` program is also known as `crond`.
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## Install
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The crontab program might have various names, like `cronie` or `crond`.
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```bash
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sudo apt search -n ^cron
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@ -19,33 +17,29 @@ sudo systemctl list-unit-files | grep cron
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sudo systemctl enable --now $NAME
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```
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## Usage
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Show your current crontab:
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Make a file for your crontab, like this:
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```bash
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crontab -l
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```
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You can put this in a file and edit it:
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```bash
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crontab -l > $filename
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echo '39 3 */3 * * /bin/tar czf /tmp/etc_backup.tgz /etc/' >> $filename
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echo '39 */3 * * * /usr/bin/updatedb' > "$USER".cron
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```
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Then apply that crontab:
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```bash
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crontab $filename
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rm $filename
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crontab "$USER".cron
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rm "$USER".cron
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```
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The `cron` program will check your syntax before adding the tab.
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Your crontab file sits somewhere in `/var/spool/`.
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Probably in `/var/spool/cron`.
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Check how your tab currently looks:
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```bash
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crontab -l
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```
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## Syntax
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`* * * * *`
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@ -56,61 +50,43 @@ These five points refer to:
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So '3pm every Sunday' would be:
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`0 15 * * 7`
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> 0 15 * * 7
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Here 'Sunday' is indicated by "7", and '3pm' is 'the 15th hour'.
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The minute is '0' (i.e. '0 minutes past three pm').
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Doing the same thing, but only in February, would be:
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`0 15 * 2 7`
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> 0 15 * 2 7
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### Variables
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`cronie` doesn't know where you live, so to put something in your `$HOME` directory, you have to tell it:
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### Full Paths
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Executing something requires the full path to where it is, so you cannot simply use `apt update -y`, because cron does not know where `apt` is.
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Instead, find out where it is:
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```bash
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echo "HOME=$HOME" > $filename
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crontab -l >> $filename
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crontab $filename
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type -P apt
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```
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`cronie` doesn't know where anything lives, including programs.
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You can give it your usual `$PATH` variable like this:
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`/usr/bin/apt`
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Then put that into the crontab:
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```bash
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echo $PATH > $filename
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crontab -l >> $filename
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crontab $filename
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sudo crontab -e
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```
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Now instead of doing this
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> 40 */3 * * * /usr/bin/apt update -y
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`40 */3 * * * /usr/bin/du -sh $HOME/* | sort -h > $HOME/sum.txt`
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This will run `apt update -y` as root every 3 hours, at 40 minutes past the hour, e.g. 00:40, 03:40, 06:40.
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You can simply do this:
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`40 */3 * * * du -sh $HOME/* | sort -h > $HOME/sum.txt`
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## Run as Root
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## Directories
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You can execute a script as root by putting it into a directory, instead of in the tab.
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Look at the available cron directories:
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```bash
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ls -d /etc/cron.*
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```
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Make a script which runs daily:
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```bash
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f=apt_update.sh
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echo '#!/bin/bash' > $f
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echo 'apt update --yes' >> $f
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chmod +x $f
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sudo mv $f /etc/cron.daily/
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ls /etc/cron.\*
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```
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### Testing with runparts
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@ -121,9 +97,47 @@ Run-parts runs all executable scripts in a directory.
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run-parts /etc/cron.hourly
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```
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# Troubleshooting
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## Tips
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### Variables
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Add your `$HOME` to crontab to use scripts.
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First add `HOME=/home/$USER`, then you can use syntax like this:
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0 * * * * $HOME/.scripts/myScript.sh
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*Remember to test the script by executing that line first*:
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```bash
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$HOME/.scripts/myScript.sh
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```
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You can also add your regular path to your crontab as a variable (see example below).
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If you're using vim as the editor, just run this at the top of your crontab:
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```bash
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:r!echo PATH=$PATH
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```
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### `date` Commands
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Cron doesn't understand the `%` sign, so if you want to use `date +%R`, then it should be escaped with a backslash: `date +\%R`.
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### File Location
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The crontab files are in `/var/spool/cron/`, so you can backup or restore them.
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# Example
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```
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HOME=/home/user
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PATH=/usr/condabin:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/home/user/.local/bin:/home/user/.scripts/:/home/user/.local/bin:/home/user/.scripts/
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1 0 1 * * /usr/bin/mkdir -p $HOME/arc/$(date +\%Y/\%m)
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18 0 1 */3 * $HOME/.scripts/mail-clean.sh
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* * * * * ping -c 1 home || mail-pull.sh
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50 18 * * * /usr/bin/timeout 30m /usr/bin/syncthing
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```
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@ -1,9 +1,9 @@
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---
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title: "git-secret"
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title: "git secret"
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tags: [ "data", "git" ]
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---
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This utility is largely useless, as it can only identify people by their email.
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So if someone has multiple GPG keys associated with one email, the tool will not work.
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A broken tool is better than a tool which will break soon.
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Worse than not working, it may 'suddenly' stop working as you try to transfer a secret to someone, who then discovers that `git-secret` requires them to mess about with their GPG keyring in order to use the repository.
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@ -1,47 +1,33 @@
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---
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title: "sc-im"
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tags: [ "Documentation", "TUI", "data" ]
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tags: [ "Documentation", "data" ]
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---
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- [Sample file](sc-im/sample.sc)
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# Basic Commands
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## See Cells
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> H = highest part
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> L = lowest part
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> gg = top
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Cells are hard to see.
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Change this with `:set autowrap`.
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> g$ = most right.
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> g0 = most left.
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Make `sc-im` always autowrap:
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> \ = insert middle
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> \> = insert left
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> < = insert right
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```bash
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mkdir .config/sc-im/bash
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echo 'set autowrap' >> .config/sc-im/scimrc
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```
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gb4 = to to cell b4
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## Movement
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> aa = see all text in cells
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> f = format cells so you can see it.
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> fl = format wider right
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> fh = format smaller left
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| Command | Key |
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|:------------------------------------|:---:|
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| highest part | H |
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| lowest part | L |
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| top | gg |
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| most right. | g$ |
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| most left. | g0 |
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| insert middle | \ |
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| insert left | \> |
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| insert right | < |
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| to to cell b4 | gb4 |
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| see all text in cells | aa |
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| format cells so you can see it. | f |
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| format wider right | fl |
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| format smaller left | fh |
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| format wider down | fj |
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| format smaller down | fk |
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> fj = format wider down
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> fk = format smaller down
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## Edit
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# Edit
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### Text
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## Text
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| Action | Key |
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|:----------------------|:---:|
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@ -49,7 +35,7 @@ echo 'set autowrap' >> .config/sc-im/scimrc
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| text (right align) | > |
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| Edit existing text | E |
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### Meta Actions
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## Meta Actions
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| Action | Key |
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|:----------------------|:---:|
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@ -62,7 +48,7 @@ echo 'set autowrap' >> .config/sc-im/scimrc
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| delete a cell | x |
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### Functions
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## Functions
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| Action | Key |
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|:--------------------------------|:------------:|
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@ -72,7 +58,7 @@ echo 'set autowrap' >> .config/sc-im/scimrc
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| minimumof those numbers | =@min(B1:B8) |
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| multiply C1 to C8 | =@prod(C1:C8)|
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### Visual
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## Visual
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| Action | Key |
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|:--------------------------------|:------------:|
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@ -1,38 +0,0 @@
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# This data file was generated by the Spreadsheet Calculator Improvised (sc-im)
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# You almost certainly shouldn't edit it.
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newsheet "Sheet1"
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movetosheet "Sheet1"
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offscr_sc_cols 0
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offscr_sc_rows 0
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nb_frozen_rows 1
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nb_frozen_cols 0
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nb_frozen_screenrows 2
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nb_frozen_screencols 0
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format A 14 1 0
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format B 18 2 0
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format 0 2
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freeze 0
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label A0 = "Food by Weight"
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leftstring B0 = "No. Meals"
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leftstring A1 = "Ajvar"
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let A1 = 5
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let B1 = A1*$A$10
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leftstring A2 = "Apples"
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let A2 = 3
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let B2 = A2*$A$10
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leftstring A3 = "Rocket"
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let A3 = 0.2
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let B3 = A3*$A$10
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leftstring A4 = "Beli Cheese"
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let A4 = 1
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let B4 = A4*$A$10
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leftstring A6 = "Total"
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let A6 = @sum(A1:A4)
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leftstring B6 = "Total"
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let B6 = @sum(B1:B4)
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leftstring A7 = "Average"
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let A7 = @avg(A1:A4)
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leftstring A10 = "Weight of Meal"
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let A10 = 0.3
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goto A0
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@ -39,7 +39,7 @@ Try placing this in a file:
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> [ One ] { fill: seagreen; color: white; } -- label --> [ Two ] { shape: triangle; }
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>
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> [ One ] => { arrow-style: closed; } [ Three ] { border-style: none; }
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> [ One ] => { arrow-style: closed; } [ Three ]
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>
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> [ Five ] { fill: maroon; color: yellow; } <=> [ Three ]
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>
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@ -54,15 +54,3 @@ Try placing this in a file:
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> [ Eight ] .. [ None ] { shape: none; fill: red; color: brown; }
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>
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> [ no Network ] --> [ Is there an IP address? ]
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> [ Little Group: o]
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```
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echo "( EU [ Madrid ] <---> [ K ] {label: Karlsruhe;}
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<== ...O\n ..o\n .O\no \nchoo choo ==> [ Cern ] [ Cern ] <== ...O\n ..o\n .O\no \nchoo choo ==> [ Paris ] <...> [ B ] {label: Budapest} )
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[ B ] <---> [ Belgrade ] [ G ] {label: Glasgow; }
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<==> [ M ] {label: Manchester },
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[ Madrid ] <---> [ Belgrade ] [ M ] <--> [ London ] <--> [ B ],
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[ Belgrade ]" | graph-easy --boxart
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```
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@ -13,14 +13,11 @@ The ordering of `/etc/fstab` is
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5. dump
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6. pass
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E.g.:
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*Example:*
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```
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UUID=877f14e8-4738-46b0-884f-ba330dad1a7d /mnt/biggie ext4 nofail,rw,relatime 0 2
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UUID=B21648C416488AF5 /mnt/share ntfs nofail,rw,nosuid,nodev,user_id=0,group_id=0,allow_other,blksize=4096 0 0
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```
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> UUID=877f14e8-4738-46b0-884f-ba330dad1a7d /mnt/biggie ext4 nofail,rw,relatime 0 2
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>
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> UUID=B21648C416488AF5 /mnt/share ntfs nofail,rw,nosuid,nodev,user_id=0,group_id=0,allow_other,blksize=4096 0 0
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## 5: Dump
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@ -22,8 +22,3 @@ REP=5
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free --lohi -g -s $REP | lolcat
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```
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Check the next thing cron will do:
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||||
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||||
```bash
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cronnext /var/spool/cron/$USER -l
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```
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||||
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||||
@ -10,12 +10,6 @@ See a running log of all system messages:
|
||||
journalctl -f
|
||||
```
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||||
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||||
Or just one user:
|
||||
|
||||
```bash
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||||
journalctl --user -f
|
||||
```
|
||||
|
||||
Or just one unit (`sshd`):
|
||||
|
||||
```bash
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user