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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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Very useful for finding all files over a specified size, such as out of control log files chewing up all available disk space. Fedora Core x specific version.
Prints a graphical directory tree from your current directory
Do ls with permissions written in octal form.
Shows the current directory and those below it in a simple tree structure. Recommended use:
This command would be useful when it is desirable to list only the directories. 'egrep' chooses only the lines that begin with 'd'.
Useful for examining hostile processes (backdoors,proxies)
A simple way using a for loop
strace can be invaluable in trying to figure out what the heck some misbehaving program is doing. There are number of useful flags to limit and control its output, and to attach to already running programs. (See also 'ltrace'.)
If you spend all day editing in vi then switching your fingers to Emacs mode just for the command line can be difficult. Use set -o vi in your bash shell and enjoy the power of a real editor.
Does an 'ls' on just the files and directories in the current directory with an execute bit turned on. This version will list directories. Just tack on "-type f" to the start of the find to omit listing directories and list only files.