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Simplification of "sed 'your sed stuff here' file > file2 && mv file2 file"

How to backup hard disk timely?
Creates files in $DATE and hardlinks existing files to $PREVDATE. Thus full backup in each directory. Only drawback is changed modification time. Recommend a wrapper script to determine $DATE and $PREVDATE. Works like a charm. (Dirvish handrolled)

Count git commits since specific commit

check open ports without netstat or lsof

Rotate a set of photos matching their EXIF data.
You need jhead package.

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" }

Query Wikipedia via console over DNS
Shorter version, works with multiple words.

Generate list of words and their frequencies in a text file.

convert from decimal to hexadecimal

Create a new file


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