Commands by rlinux57 (1)

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Recover resolution when a fullscreen program crashes and you're stuck with a tiny X resolution
This forces X back to its maximum resolution configured. To get a list, type `xrandr'.

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

scp a good script from host A which has no public access to host C, but with a hop by host B
middlehost allows ssh access from where you are but not securehost. Use nice ssh piping to simulate scp through A => B => C setting up the shell function if left as an exercise for the reader. ;-) Agent forwarding should avoid password typing.

Run a command if file/directory changes
Example: $ runonchange /etc/nginx nginx -t Ignores vim temp files. Depends on 'inotify-tools' for monitoring of file changes. Alternative to tools like 'entr', 'watchr'.

vi a remote file with port
If you are running sshd on different port use above this command to edit/view remote file with vi/vim. In above example I am using port 12345.

Compare two directories
Output of this command is the difference of recursive file lists in two directories (very quick!). To view differences in content of files too, use the command submitted by mariusbutuc (very slow!): $ diff -rq path_to_dir1 path_to_dir2

Find the package that installed a command

Print number of mb of free ram

When was your OS installed?
Show time and date when you installed your OS.

converts a directory full of source tarballs into a bzr repository so you can compare different versions easily


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