various deletions

This commit is contained in:
Malin Freeborn 2020-01-10 05:19:29 +01:00
parent 4cdfe209f5
commit 125bacf71c
8 changed files with 46 additions and 53 deletions

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# Automatic Backups with `find`
> find /home/"$(whoami)" -type f -size -2M | xargs zip -u backup
# Tar Archives
Create ze files:
*C*reate *z*e *f*iles!
> tar czf file.tar.gz file1 file2
Extract ze files:
E*x*tract *z*e *f*iles:
> tar xzf file.tar.gz
@ -16,29 +12,11 @@ The .tar extension means two or more files are bundled together into a single fi
Tarballs come with a number of arguments.
- c means 'create'.
## More Compression
- v means 'verbose'.
Extremely compressed files take longer to compress, but take up less disk space.
- f means 'this is the file' and must always be the ultimate argument.
- z means compression.
So we can compress file1 and file2 into a single tar called 'archive' with:
> tar czvf archive.tar.gz file1 file2
Extraction uses 'x' instead of 'c'.
> tar xzvf archive.tar.gz
Create a very compressed file:
> tar cfj super-compressed.tar.gz file1 file2
# Example - Compressing all Latex Files in /home/
> sudo find ~ -maxdepth 4 -name "*.txt" | xargs tar cvf latex-bundle.tar.gz
> tar cfj super-compressed.tar.bz2 file1 file2
# ssh backup
@ -46,7 +24,7 @@ Back up an unmounted partition with ssh:
> sudo dd if=/dev/sda1 | ssh -C ghost@192.168.0.10 "dd of=/home/ghost/backup.img" status=progress
# img.xz
# `xz`
Install `xz`.
@ -58,3 +36,23 @@ This then deletes the .xz file. To keep it:
> unxz --keep void.img.xz
# `zip`
Zip file1-3, and make a zip file called 'newsip.zip'.
> zip newsip file1 file2 file3
# Automatic Backups with `find`
## `tar`
Compressing all Latex Files in /home/.
> sudo find ~ -maxdepth 4 -name "*.txt" | xargs tar cvf latex-bundle.tar.gz
## `zip
Install `zip`.
> find /home/"$(whoami)" -type f -size -2M | xargs zip -u backup

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`at` must be installed with:
> sudo apt-get install at
Then jobs can be specified with absolute time, such as:
> at 16:20
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> atrm 2
Check /var/spool/cron/
Check /var/spool/atd/

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@ -15,6 +15,7 @@ A double pipe will try one, and do the other if that fails.
> cp -r ~/Archive ~/Backup || tar czf Archive.tar.gz *
# REGEX
Regular expression characters include:
\\ ^ $ . | ? * + () [] {}
@ -26,6 +27,7 @@ As a result, grep cannot read these characters as literal characters unless they
... will search the string 'wtf?' in the file log.txt. Another version is egrep (now used with 'grep -e') which uses more characters as special characters, or fgrep, which treats all characters as literal strings.
# Environmental Variables
PWD, USER, PATH
To display all environmental (but not local) variables, use
@ -79,6 +81,7 @@ The sort function arranges lines alphabetically. Use -r to reverse and -n to so
Edit all examples of hey to hoi in greetings and print that to the file.
# Measurement
Measure how long a script takes for super-autism powers.
> time [bash script]

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@ -32,18 +32,6 @@ Ctrl+c at boot then add in
None of this is used by humans anymore - it's all systemd.
# Systemd
See what's running with ....
> systemctl list-units
Stop, start, whatever with:
systemctl enable|stop|start httpd
This starts httpd (Fedora's word for Apache2).
# Boot Records
'File System Tab' under /etc/fstab keeps track of the partitions and boot order.

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# Basics
# `date`
Show system time:
@ -20,6 +20,18 @@ Manually set the hardware time to a specified date:
> sudo hwclock --set --date="8/25/19 13:30:00"
## Normal Date
> date +%d/%m/%y
# Unix Time
Computers started counting time on January 1st, 1970, and added one second-per-second. If your clock shows you're in the 70's, it's reset to the start.
Track the time in Unix-time:
> date +%s
# Network Time Providers
Servers which take their time from an observatory we call Stratum 1 servers. Servers which takes their time from Stratum n servers are Stratum n+1 servers.

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On Debian, a file might gain DNS services by adding the following to /etc/network/interfaces:
----------------
```
auto eth0
iface eth0 inet static
address 10.0.0.23
@ -11,7 +12,7 @@ iface eth0 inet static
dns-nameservers 208.67.222.222 208.67.220.220
dns-search example.com
----------------
```
# URL Aliases

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@ -49,7 +49,3 @@ Copy to and from with:
or
> rclone copyto foo google:test