Commands by LrdShaper (4)

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start a tunnel from some machine's port 80 to your local post 2001
now you can acces the website by going to http://localhost:2001/

list block devices
Shows all block devices in a tree with descruptions of what they are.

Search Google

count how many cat processes are running
'ps ax' provides the fill list of running processes. 'grep -c [c]at' will find all processes that match 'cat' without matching itself....

Find default gateway

shutdown pc in 4 hours without needing to keep terminal open / user logged in.
This way, you can specify how many hours in which you want your machine to shut down.

List processes playing sound
When trying to play a sound you may sometimes get an error saying that your sound card is already used, but not by what process. This will list all processes playing sound, useful to kill processes that you no longer need but that keep using your sound card.

Convert from octal format to umask
Umask is obtained subtracting 7 from each cypher of octal format. I store octal perm format in an array,then for each element of array I subtract 7. The result is the umask.

seq (argc=2) for FreeBSD

Show errors in the kernel ring buffer
Much more useful then parsing syslog


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