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Download all default installed apk files from your android.

Find unused IPs on a given subnet

Ultimate current directory usage command
Based on the MrMerry one, just add some visuals to differentiate files and directories

change directory to actual path instead of symlink path
If you use symlinks a lot, especially nested symlinks, this puts you back on the absolute path to command-line-fu-nirvana. (Note the backticks around pwd).

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"

Delete all local git branches that have been merged
This checks if the branch has been merged with master and then will delete the ones that have been. Keeps your local git repo nice and clean from all the branches.

Send e-mail if host is 'dead' or not reachable
Cleaner with a mailto assignment in crontab (if the command fails you get an email): MAILTO=admin@example.com 10,30,50 * * * * ping -q -c1 -w3 192.168.0.14 >/dev/null

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

Test for Weak SSL Ciphers
...if you get a certificate back, the server is accepting weak SSL ciphers


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