Commands by Rida (0)

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Recursive find and replace file extension / suffix (mass rename files)
Find recursively all files in ~/Notes with the extension '.md' and pipe that via xargs to rename command, which will replace every '.md' to '.txt' in this example (existing files will not be overwritten).

Display last exit status of a command
The variable ? contain the last exit status of a command, it can be printed for troubleshooting purpose.

convert png into jpg using imagemagick

Sort a character string
Sorts a character string, using common shell commands.

Get File Names from touch commands
retrieve file names back from touch commands for them

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Build an exhaustive list of maildir folders for mutt
Of course, you can adjust "Maildir" to your config...

check open ports without netstat or lsof

Determine space taken by files of certain type
Just how much space are those zillions of database logs taking up ? How much will you gain on a compression rate of say 80% ? This little line gives you a good start for your calculations.

Use result of the last command
\$ which python /usr/bin/python \$ ll `!!` lrwxrwxrwx 1 root root 9 2010-11-08 22:01 /usr/bin/python -> python2.6


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