Commands by ranjha (1)

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ls -qahlSr # list all files in size order - largest last
I find it useful, when cleaning up deleting unwanted files to make more space, to list in size order so I can delete the largest first. Note that using "q" shows files with non-printing characters in name. In this sample output (above), I found two copies of the same iso file both of which are immediate "delete candidates" for me.

check open ports without netstat or lsof

Show word-by-word differences between two latex files, in color

list files recursively by size

Remove all zero size files from current directory (not recursive)
works only in zsh

Better recursive grep with pretty colors... requires ruby and gems (run: "gem install rak")

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

finding more large files

Remove security limitations from PDF documents using QPDF
Remove security restrictions from PDF documents using this very simple command on Linux and OSX. You need QPDF installed (http://qpdf.sourceforge.net/) for this to work.

Copy ssh keys to user@host to enable password-less ssh logins.
To generate the keys use the command ssh-keygen

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