Commands by lingo (11)

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Find the package that installed a command

prevent accidents and test your command with echo
if you're using wildcards * or ? in your command, and if you're deleting, moving multiple files, it's always safe to see how those wildcards will expand. if you put "echo" in front of your command, the expanded form of your command will be printed. It's better safe than sorry.

Output Detailed Process Tree for any User
An easy function to get a process tree listing (very detailed) for all the processes of any gived user. This function is also in my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

Rsync files with spaces
Using the double dash before the source and target makes the command work fine with weird filenames.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Quickly analyse an Apache error log
This searches the Apache error_log for each of the 5 most significant Apache error levels, if any are found the date is then cut from the output in order to sort then print the most common occurrence of each error.

scroll file one line at a time (w/only UNIX base utilities)
usage examples ls largedir |rd lynx -dump largewebsite.com |rd rd < largelogfile

Create Solid Archive (best compression) with 7z
Creates a solid archive with the highest possible compression (Ultra). Advantage of 7z is that it will use all the processor cores to create the archive. (Ok. at least version 9.04 does)

Generate a random password 30 characters long

Run a command as root, with a delay
$ sleep 1h ; sudo command or $ sudo sleep 1h ; sudo command won't work, because by the time the delay is up, sudo will want your password again.


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