Commands by dfaulkner

Commands by dfaulkner (4)

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Shows users and 'virtual users' on your a unix-type system
This is sample output - yours may be different.
-3

ps -axgu | cut -f1 -d' ' | sort -u

dfaulkner · 2010-07-07 12:29:46 6
Shows users and 'virtual users' on your a unix-type system

Shows a list of users that currently running processes are executing as. YMMV regarding ps and it's many variants. For example, you might need: ps -axgu | cut -f1 -d' ' | sort -u Show Sample Output
This is sample output - yours may be different.
```
USER
_coreaudiod
_locationd
_lp     
_mdnsresponder
_spotlight
_usbmuxd
_windowserver
_www    
daemon  
dfaulkner    
root    
```
2

ps -eo user | sort -u

dfaulkner · 2010-07-07 12:28:44 8
convert ascii string to hex
This is sample output - yours may be different.
1

echo $ascii | perl -ne 'printf ("%x", ord($1)) while(/(.)/g); print "\n";'

dfaulkner · 2010-04-17 16:26:29 4
convert a string of hex characters into ascii chars
This is sample output - yours may be different.
0

echo $hex | perl -pe 's/(..)/chr(hex($1))/ge'

dfaulkner · 2010-04-17 16:24:48 6

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Extract tarball from internet without local saving

Calculates the date 2 weeks ago from Saturday the specified format.

Good for automating reports that need to run from between two dates.

Reverse SSH

this command from the source server and this follow in the destination server: ssh user@localhost -p 8888

Cleanup debian/ubuntu package configurations

Sometimes, simpler is better.

Launch a game, like Tetris, when apt-get installing an app larger than 50 Megabytes

Change the APP variable's value to whatever you want to install. Depending on how fast your machine is, you'll want to adjust the value 50 to something else. You might also want to play a different game than Gnometris - just make sure it's a GUI game.

Random Futurama quote

Random Futurama quote from http://cubemonkey.net/quotes/. Change the quote= to change the quote source.

find an unused unprivileged TCP port

Some commands (such as netcat) have a port option but how can you know which ports are unused?

Update pandoc via cabal

An alternative to built-in package manager, keep pandoc in sync with upstream releases.

Quick way to sum every numbers in a file written line by line

If you have a file full of numbers written line by line, you can sum every line to get the total. With a file like this: 3443535 9878977 67554 987798 232324 you will got: 14610188

display a smiling smiley if the command succeeded and a sad smiley if the command failed

you could save the code between if and fi to a shell script named smiley.sh with the first argument as and then do a smiley.sh to see if the command succeeded. a bit needless but who cares ;)

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