Commands using ls (517)

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Update twitter with Perl
Requires Net::Twitter. Just replace the double quoted strings with the appropriate info.

List the size (in human readable form) of all sub folders from the current location

Color man pages
Add the followin to ~/.bashrc #colour export LESS_TERMCAP_mb=$'\E[01;31m' export LESS_TERMCAP_md=$'\E[01;37m' export LESS_TERMCAP_me=$'\E[0m' export LESS_TERMCAP_se=$'\E[0m' export LESS_TERMCAP_so=$'\E[01;44;33m' export LESS_TERMCAP_ue=$'\E[0m' export LESS_TERMCAP_us=$'\E[01;32m'

Change the primary group of a user

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Removing images by size
Removes all png files whose geometry is not 280x190 pixels

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Getting the last argument from the previous command

Email someone if a web page has been updated.
A cronjob command line to email someone when a webpages homepage is updated.

Gzip files older than 10 days matching *
Useful for a cron job that runs nightly, gzipping or alternatively deleting files from a specific directory that are older than 10 days (in this case)


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