Commands by andrepuel (3)

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Quickly CD Out Of Directories
`up 3` will climb the directory tree by three steps. `up asdf` will do nothing, and returns exit code 1 as an error should.

escape any command aliases
e.g. if rm is aliased for 'rm -i', you can escape the alias by prepending a backslash: rm [file] # WILL prompt for confirmation per the alias \rm [file] # will NOT prompt for confirmation per the default behavior of the command

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

lists files and folders in a folder
lists files and folders in a folder with summary.

Remove security limitations from PDF documents using ghostscript (for Windows)
#4345 also works under windows

list block devices
Shows all block devices in a tree with descruptions of what they are.

Backup a file with a date-time stamp
1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }

Fork bomb (don't actually execute)
Retrieved from: https://en.wikipedia.org/wiki/Fork_bomb More info: http://stackoverflow.com/questions/991142/how-does-this-bash-fork-bomb-work

Set blanket packet/second limit on network interface for Ubuntu VPS server
VPS server hosts suspect DOS attack if PPS is too high. This limits packets at the interface level. Do "sudo apt-get install iptables-persistent" to make persistent, or, if you already have, reconfigure with "sudo dpkg-reconfigure iptables-persistent"

merge vob files to mpg


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