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Bash logger

Increment the filename of png in a given directory by one

recursive search and replace old with new string, inside files
xargs deals badly with special characters (such as space, ' and "). To see the problem try this: touch important_file touch 'not important_file' ls not* | xargs rm Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

Maximum PNG compression with optipng, advpng, and advdef
optipng and advancecomp (for the the advpng and advdef tools) are the best FOSS tools for losslessly compressing PNGs. With the above tool chain, you can cut off as much as 20% off a PNG's file size.

get a rough estimate about how much disk space is used by all the currently installed debian packages
The vaule is expressed in megabytes

quickly rename a file

remove audio trac from a video file
create a copy of a video file without the audio tracs

Ping sweep without NMAP
Waits for all pings to complete and returns ip with mac address

Efficient remote forensic disk acquisition gpg-crypted for multiple recipients
Acquires a bit-by-bit data image, gzip-compresses it on multiple cores (pigz) and encrypts the data for multiple recipients (gpg -e -r). It finally sends it off to a remote machine.

return external ip


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