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make, or run a script, everytime a file in a directory is modified

Append last argument to last command
Just like "!$", except it does it instantly. Then you can hit enter if you want.

Undo commit in Mercurial

Calculates the date 2 weeks ago from Saturday the specified format.
Good for automating reports that need to run from between two dates.

Video thumbnail
Faster thumbnail creation than '-itsoffset' $ffmpeg -itsoffset -4 -i test.avi -vcodec mjpeg -vframes 1 -an -f rawvideo -s 320x240 test.jpg

Find Duplicate Files (based on MD5 hash)
Calculates md5 sum of files. sort (required for uniq to work). uniq based on only the hash. use cut ro remove the hash from the result.

List files in directory tree with newest last

Change/Modify timestamp interactively

Blink LED Port of NIC Card
Blinks LED of a NIC card. Its used when you have multiple NICs and you want to identify the physical port of a particular ethernet card.

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }


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