All commands

Exit with empty line

Just type 2 characters and enter, you will be back.

when I turn on my wifi, I always have to put in this command in order to make my laptop notice the wifi.

This command kills all processes with 'SomeCommand' in the process name. There are other more elegant ways to extract the process names from ps but they are hard to remember and not portable across platforms. Use this command with caution as you could accidentally kill other matching processes!

xargs is particularly handy in this case because it makes it easy to feed the process IDs to kill and it also ensures that you don't try to feed too many PIDs to kill at once and overflow the command-line buffer.

Note that if you are attempting to kill many thousands of runaway processes at once you should use 'kill -9'. Otherwise the system will try to bring each process into memory before killing it and you could run out of memory. Typically when you want to kill many processes at once it is because you are already in a low memory situation so if you don't 'kill -9' you will make things worse

Esse comando procura por arquivos php que que iniciem com '

Useful for if you want to create a log file every now and again or wish to record file names with date and time. You can't use the / for file names. so this replaces the / with a -

Windows only

documents all active ips on a subnet and saves to txt file.

Reconstruct standard permissions for directories and files in current directory

This works in multiple unixes, not only linux, for different paths.

On solaris, if you do not have which, you can use:

ksh whence -p anypath/a_command.sh | sed "s|^./|$(pwd)|" ksh whence -p

It takes a hunk and shows the different between the three file. Useful when you want to compare two different changed file which from the same base file.

(use emacs ediff3, eyecandy and more useful if you want to merge them from anywhere to anywhere)

generally we cannot use control + v to paste text copied in clipboard

but by pressing control and holding it press shift and v

Remove all zero size files from current directory. Its a not recursive option like:

find . -size 0c -exec rm {} \;

with this command you can empty file

you should umount /dev/cdrom before using this cli

This allows you to display the wireshark program running on remote pc to your local pc.

Read all contents from current directory and display it on stdout.

Gets you the latest of everything, and removes any remaining junk. The "sh -c" part is so that you'll only run a single sh command, so you won't get asked more than once for the password.

This allows you to search through your history using the up and down arrows ? i.e. type "cd /" and press the up arrow and you'll search through everything in your history that starts with "cd /".

rsync is the best command ever and I am interested what the rest of you think is the best command