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draw line separator (using knoppix5 idea)

creating you're logging function for your script
You could also pipe to logger.

Null a file with sudo

Show only existing executable dirs in PATH using only builtin bash commands
Finds executable and existing directories in your path that can be useful if migrating a profile script to another system. This is faster and smaller than any other method due to using only bash builtin commands. See also: + http://www.commandlinefu.com/commands/view/743/list-all-execs-in-path-usefull-for-grepping-the-resulting-list + http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

List all available commands (bash, ksh93)

Delete all non-printing characters from a file
tr has some predefined sets of characters that are more convenient to use than characters codes

Run the last command as root - (Open)Solaris version with RBAC

Never rewrites a file while copying (or moving)
Allows you to preserve your files when using cp, mv, ln, install or patch. When the target file exists, it will generate a file named XXX.~N~ (N is an auto-incremental number) instead of deleting the target file.

List your largest installed packages (on Debian/Ubuntu)
The other commands were good, but they included packages that were installed and then removed. This command only shows packages that are currently installed, sorts smallest to largest, and formats the sizes to be human readable.

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously


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