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Delete a file/directory walking subdirectories (bash4 or zsh)

du with colored bar graph
A more efficient way, with reversed order to put the focus in the big ones.

Get max number of arguments
Get max number of arguments that can be accepted by the exec() system call.

Compress excutable files in place.
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them. FYI: You can compress any executable sha-bang scripts as well (py, pl, sh, tcl, etc.).

Save a file you edited in vim without the needed permissions - (Open)solaris version with RBAC

Mplayer save stream to file
To save any streaming url content to a file.

Find out the starting directory of a script
Invoked from within a shell script, this will print the directory in which the script resides. Doesn't depend on external tools, /proc/self/*, etc.. (`echo` is a shell builtin.) To see the *current working* directory of a script, use `pwd`.

tail: watch a filelog
-f file(s) to be monitorized -n number of last line to be printed on the screen in this example, the content of two files are displayed

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

Display a block of text: multi-line grep with perl
-n reads input, line by line, in a loop sending to $_ Equivalent to while () { mycode } -e execute the following quoted string (i.e. do the following on the same line as the perl command) the elipses .. operator behaves like a range, remembering the state from line to line.


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Follow the Tweets.

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