One liners
My collection of one liners, commands, hacks that make my life easier (just to not forget them):
Renaming files
Rename from one extension to another:
user@computer:$ rename 's/\.err$/\.dat/' *.err
Remove extension:
user@computer:$ rename 's/\.err$//' *.err
Replacing strings
Replace Me with You
user@computer:$ sed -i 's/Me/You/g' file_name
Other
Show listening ports:
user@computer:$ netstat -an | grep LISTEN
Edit two files in diff mode:
user@computer:$ vimdiff file_name
Remove comments and empty lines with grep:
user@computer:$ grep -v -e ^# -e ^$ file.txt
