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back ssh from firewalled hosts
host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

Remove all unused kernels with apt-get
Note the double space: "...^ii␣␣linux-image-2..." Like 5813, but fixes two bugs: [1]This leaves the meta-packages 'linux-headers-generic' and 'linux-image-generic' alone so that automatic upgrades work correctly in the future. [2]Kernels newer than the currently running one are left alone (this can happen if you didn't reboot after installing a new kernel). I'm bummed that this took 228 characters. I'd like to see a simpler version.

Regnerate Exif thumbnail.
Regnerate Exif thumbnail.

Know which modules are loaded on an Apache server
This let you know which modules has loaded the Apache server, very useful to know if the mod_rewrite is ready to use.

Find out current working directory of a process

Check whether laptop is running on battery or cable
The original proc file doesn't exist on my system.

create ICO file with more than one image
requires imagemagick. -background transparent is of course optional.

Backup sda5 partition to ftp ( using pipes and gziped backup )

shortcut to scp a file to the same location on a remote machine
This will copy a file from your current directory to the same location on another machine. Handy for configuring ha, copying your resolv.conf, .bashrc, anything in /usr/local, etc.

Sort IPV4 ip addresses


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