Commands by tkb (1)

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List users with running processes
This is different that `who` in that who only cares about logged-in users running shells, this command will show all daemon users and what not; also users logged in remotely via SSH but are running SFTP/SCP only and not a shell.

list files recursively by size

Find the package that installed a command

diff will usually only take one file from STDIN. This is a method to take the result of two streams and compare with diff. The example I use to compare two iTunes libraries but it is generally applicable.
diff is designed to compare two files. You can also compare directories. In this form, bash uses 'process substitution' in place of a file as an input to diff. Each input to diff can be filtered as you choose. I use find and egrep to select the files to compare.

Who needs pipes?
or: C

Copy structure
Copies a dir structure without the files in it.

execute your commands and avoid history records
$ secret_command;export HISTCONTROL= This will make "secret_command" not appear in "history" list.

Lint Git unstaged PHP files
Checks for syntax errors in PHP files modified in current working copy of a Git repository.

Dump a web page
Useful to browse dangerous web sites.

Selecting a random file/folder of a folder
Also looks in subfolders

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