Commands by ahofmann (1)

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Merge Two or More PDFs into a New Document
require the pdftk package

delete a particular line by line number in file
deletes line 3 in known_hosts text file

Terminal redirection
Will redirect output of current session to another terminal, e.g. /dev/pts/3 Courtesy of bassu, http://www.commandlinefu.com/commands/by/bassu

Resolve the "all display buffers are busy, please try later" error on a Foundry

switch case of a text file

An alias to re-run last command with sudo. Similar to "sudo !!"
I didn't come up with this myself, but I always add this to my .bash_aliases file. It's essentially the same idea as running "sudo !!" except it's much easier to type. (You can't just alias "sudo !!", it doesn't really work for reasons I don't understand.) "fc" is a shell built-in for editing and re-running previous commands. The -l flag tells it to display the line rather than edit it, and the -n command tells it to omit the line number. -1 tells it to print the previous line. For more detail: $help fc

Discovering all open files/dirs underneath a directory
It may be helpful in case you need to umount a directory and some process is preventing you to do so keeping the folder busy. The lsof may process the +D option slowly and may require a significant amount of memory because it will descend the full dir tree. On the other hand it will neither follow symlinks nor other file systems.

A very simple and useful stopwatch
time read -sn1 (s:silent, n:number of characters. Press any character to stop)

Quickly Encrypt a file with gnupg and email it with mailx
This is a quick and easy way of encrypting files in a datastream, without ever really creating an output file from gpg. Useful with cron also, when file(s) have to be sent based on a set schedule.

List of services sorted by boot order in Redhat-based systems

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