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du with colored bar graph
A more efficient way, with reversed order to put the focus in the big ones.

sleep until X o'clock
pauses exactly long enough to wake at the top of the hour

Convert a Python interactive session to a python script
Used to copy and paste a terminal buffer of a python interactive session into an editor

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" }

Quickly generate an MD5 hash for a text string using OpenSSL
Here Strings / A variant of here documents, the format is:

Rip audio from a video file.
Replace and accordingly.

Move files around local filesystem with tar without wasting space using an intermediate tarball.

Schedule a command while one is already running.
Useful when you have only one terminal session e.g. ssh. and want to queue up another command after the currently running has finished(in case if you forget to run that command). Originally used as ; python-updater when running emerge. When I have noticed that a package failed due to that command not run.

Merge several pdf files into a single file

create dir tree
create tree of dir's in one command


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