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use wget to check if a remote file exists
put your link [url] to check if exist the remote file

Get info on RAM Slots and Max RAM.

Watch how many tcp connections there are per state every two seconds.
slighty shorter

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

get all Amazon cloud (amazonws etc) ipv6 subnets

randomize hostname and mac address, force dhcp renew. (for anonymous networking)
this string of commands will release your dhcp address, change your mac address, generate a new random hostname and then get a new dhcp lease.

Get duration of an audio file in seconds.
This is an alternative to #9131. ffmpeg didn't work on my .au files, though it did on the .wav ones. Also useful if you don't have ffmpeg but do have sox. Handily, sox already reports in seconds (decimal).

Decreasing the cdrom device speed
Decreasing the cdrom device speed may be more comfortable to watch films (for example)

find and delete empty dirs, start in current working dir
A quick way to find and delete empty dirs, it starts in the current working directory. If you do find . -empty -type d you will see what could be removed, or to a test run.

ssh autocomplete based on ~/.ssh/config
I sue this in my .bashrc file This will also do auto-completion for scp and sftp


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