Commands using comm (11)

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Dump a configuration file without comments or whitespace...
A short, *easy-er* to remember command for stripping whitespace and comments from a config file, (or any file for that matter). Remember regex as: slash, space, star. pound, slash, bar. pointy-hat, dollar. (or "caret, dollar" if you must) :-P

Creating A Single Image Video With Audio via ffmpeg

rename a file to its md5sum

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"

check the filesystem and use a progress bar
if you happen to start with out the -C switch then you a killall -USR1 e2fsck

Use bash history with process substitution
Bash has a great history system of its commands accessed by the ! built-in history expansion operator (documented elsewhere on this site or on the web). You can combine the ! operator inside the process redirection

Extract track 9 from a CD
Using mplayer to extract audio file from a CD

find all active IP addresses in a network
You send a unicast ICMP packet to each host. Many firewalls will drop that ICMP. However, in order to send the ICMP, you'll have first done an ARP request and the remote machine is unlikely to ignore that, so the computer will be in your ARP table.

list all file extensions in a directory
A shorter version

View any archive
Part of the "atool" package.


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