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ls -qaltr # list directory in chronological order, most recent files at end of list
I find it very handy to be able to quickly see the most recently modified/created files in a directory. Note that the "q" option will reveal any files with non-printable characters in their filename.

Edit a PDF's metadata using exiftool
Edit the pdf file foo.pdf's metadata. -overwrite_original overwrites the original file (w/o it exiftool creates a new file)

list files recursively by size

list folders containing less than 2 MB of data
Just shortened the awk a bit and removed sed. Edit: I'm assuming there are no spaces in the path. To support white space in pathname try: $ awk '($1 < 2048) {sub(/^[0-9]+[ \t]+/,""); print $0}'

quickly formats a fat partition. usefull for flash drives

Remove job from crontab by commandline
The "-u USER" is optional if root user is used

list block devices
Shows all block devices in a tree with descruptions of what they are.

find and reduce 8x parallel the size of PNG images without loosing quality via optipng

Adjust display hardware brightness [dbus way]

connect via ssh using mac address
Connect to a machine running ssh using mac address by using the "arp" command


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