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Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.

wget download with multiple simultaneous connections

Take a screenshot of the focused window with a 4 second countdown
Take a screenshot of the focused window with a 4 second countdown # shorten by adding to your .bashrc: alias sss='scrot -ucd4 && eog $(ls -tr | tail -n1)' $ echo -e "\nalias sss='scrot -ucd4 && eog $(ls -tr | tail -n1)'" >> ~/.bashrc -d 4 second delay -c display countdown -u focused window man scrot for more flags

unpack all rars in current folder

Count the number of characters in each line

back ssh from firewalled hosts
host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

find text in a file
this will find text in the directory you specify and give you line where it appears.

Grab an interface's IP from ifconfig without screen clutter
Sometimes, you don't really care about all the other information that ifconfig spits at you (however useful it may otherwise be). You just want an IP. This strips out all the crap and gives you exactly what you want.

Change the primary group of a user

list block devices
Shows all block devices in a tree with descruptions of what they are.


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