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move you up one directory quickly
In bash, this turns on auto cd. If a command is just a directory name, it cd's into that directory.

See system users

underscore to camelcase

list files recursively by size

Find where a kind of file is stored
In this case searches for where .desktop files are stored. The resulted is a sorted list of the top directories containing such files.

rsync...

the same as [Esc] in vim
Faster and more convinent than [Esc]

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" }

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Sort a character string
Sorts a character string, using common shell commands.


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