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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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Convert wma to [email protected]
Convert all wma to [email protected] with ffmpeg into directory.

Compare two directory trees.
This uses Bash's "process substitution" feature to compare (using diff) the output of two different process pipelines.

check open ports without netstat or lsof

Converts uppercase chars in a string to lowercase
Another alternative is to define a function: lower() { echo ${@,,} } lower StrinG

get the top 10 longest filenames

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

Mount a Windows share on the local network (Ubuntu) with user rights and use a specific samba user

Show account security settings
Show account security settings

tee to a file descriptor
the tee command does fine with file names, but not so much with file descriptors, such as &2 (stderr). This uses process redirection to tee to the specified descriptor. In the sample output, it's being used to tee to stderr, which is connected with the terminal, and to wc -l, which is also outputting to the terminal. The result is the output of bash --version followed by the linecount

Check wireless link quality with dialog box
The variable WIRELESSINTERFACE indicates your wireless interface


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