Commands by Befictopeaut1 (0)

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combining streams
2>&1 permit to combinate stdout and stderr. grep will catch stderr and stdout instead of stdout only.

Send command to all terminals in a screen session

Track X Window events in chosen window
After executing this, click on a window you want to track X Window events in. Explaination: "xev will track events in the window with the following -id, which we get by greping window information obtained by xwininfo"

Check if running in an X session
If you want to display a dialog (using xdialog/kdialog/zenity) you need to make sure that you have a valid X session. Checks for the existence of the DISPLAY variable.

Copy ssh keys to user@host to enable password-less ssh logins.
To generate the keys use the command ssh-keygen

Recursive replace of directory and file names in the current directory.
This should work anywhere perl and grep is available. :P

Change every instance of OLD to NEW in file FILE
Very quick way to change a word in a file. I use it all the time to change variable names in my PHP scripts (sed -i 's/$oldvar/$newvar/g' index.php)

remove all spaces from all files in current folder

Go to directory or creat it and go to
For use in scripts this command is very usefull

List 10 largest directories in current directory
du -m option to not go across mounts (you usually want to run that command to find what to destroy in that partition) -a option to also list . files -k to display in kilobytes sort -n to sort in numerical order, biggest files last tail -10 to only display biggest 10

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