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Produce a pseudo random password with given length in base 64
Don't copy trailing '=' or use head -c to limit to desired length.

Quick HTML image gallery
More compact and direct.

power off system in X minutes
Replace 60 with the number of minutes until you want the machine to shut down. Alternatively give an absolute time in the format hh:mm (shutdown -h 9:30) Or shutdown right away (shutdown -h now)

resize all JPG images in folder and create new images (w/o overwriting)
Convert all jpegs in the current directory into ~1024*768 pixels and ~ 150 KBytes jpegs

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Show a git log with offsets relative to HEAD
Print a git log (in reverse order) giving a reference relative to HEAD. HEAD (the current revision) can also be referred to as HEAD~0 The previous revision is HEAD~1 then HEAD~2 etc. . Add line numbers to the git output, starting at zero: $ ... | nl -v0 | ... . Insert the string 'HEAD~' before the number using sed: $ ... | sed 's/^ \+/&HEAD~/' . Thanks to bartonski for the idea :-)

See udev at work
See how your system works with pendrives/mice/monitors/whatever-you-can-plug-in. Use cases: see on which /dev/... your peripherals are, find out if a specific udev rule is being applied correctly.

view the system console remotely
This will view the console and assumes the screen is 80 characters wide. Use /dev/vcs2 for the next virtual console.. etc.

pulsed terminal clock
hypnotizing pendulum

To create files with specific permission:


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