Commands by cmdq (1)

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Get Unique Hostnames from Apache Config Files
Get a list of all the unique hostnames from the apache configuration files. Handy to see what sites are running on a server. A slightly shorter version.

Copy your SSH public key on a remote machine for passwordless login.
Should run on any system with ssh installed.

Lurk what's going on on remote console

MP3 player
I tried a few curses based mp3 players for playing back choir practice songs for my wife. Unfortunately none of the ones I tried were capable of scrubbing a track. Firefox saves the day.

Efficiently print a line deep in a huge log file
Sed stops parsing at the match and so is much more effecient than piping head into tail or similar. Grab a line range using $ sed '999995,1000005!d' < my_massive_file

Remove duplicate entries in a file without sorting.
Using awk, find duplicates in a file without sorting, which reorders the contents. awk will not reorder them, and still find and remove duplicates which you can then redirect into another file.

which procs have $PATH_REGEX open?
faster than lsof by at least x2 on my box.

count of down available ips

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"

Doing some floating point calculations with rounding (e.g. at the 3rd decimal)


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