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Check if a string is into a variable
Returns true (0) if the string is into $var, or false (1) if not.

Day of the week of your birthday over the years.
Do you ever want to know which day of week was your birhday! Now you can check that with this command, just set your birh date at the beginning (My bday in the example) and the dates will be revealed. ;)

Extract all 404 errors from your apache accesslog (prefix lines by occurrences number)

poor man's vpn
this easy to install tool redirects all traffic to internet through ssh. it's very usefull when connecting to free wifi. you need to start it as root because it needs permissions to change iptables settings. ofcourse you also need a shell account

Enable verbose boot in Mac OS X Open Firmware

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"

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

Get your outgoing IP address

list all file extensions in a directory
If your grep doesn't have an -o option, you can use sed instead.

list files recursively by size


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