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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Show directories
Show only the subdirectories in the current directory. In the example above, /lib has 135 files and directories. With this command, the 9 dirs jump out.

Alert on Mac when server is up
When run on a mac, this command will bring up a dialog box in the Terminal when server HOSTNAME first responds to a ping.

Outputs a 10-digit random number

Get your external IP address
curl ifconfig.me/ip -> IP Adress curl ifconfig.me/host -> Remote Host curl ifconfig.me/ua ->User Agent curl ifconfig.me/port -> Port thonks to http://ifconfig.me/

Print a monthly calendar with today's date highlighted
The cal command is handy, but sometimes you want to quickly see today's date highlighted. That's why I came up with this quick command. Much like http://www.commandlinefu.com/commands/view/1342/show-this-months-calendar-with-todays-date-highlighted but cleaner and more succinct.

Search some text from all files inside a directory

Add GPG key easy - oneliner
Replace KEY with GPG key. This command will load GPG key and add it to your system so you can use software from third party repos etc.

Calculate days on which Friday the 13th occurs
I removed the dependency of the English language

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).

Increment the filename of png in a given directory by one


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