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Rename files in batch

Phrack 66 is out, but the .tar.gz is not there yet on phrack.org's website
Nice reading in the morning on the way to work, but sadly the .tar.gz for the whole issue 66 is not on phrack's website yet. So use wget to download.

Sync the date of one server to that of another.
(Useful when firewalls prevent you from using NTP.)

grep -v with multiple patterns.
If you wanted to do all in one command, you could go w/ sed instead

Quick command line math
expr will give you a quick way to do basic math from the CLI. Make sure you escape things like * and leave a space between operators and digits.

Display the size of all your home's directories
Display the size (human reading) of all the directories in your home path (~).

The program listening on port 8080 through IPv6
Gets the application's name that's listening from the port 8080 through IPv6

extracting audio and video from a movie
rips the audio and video stream of a movie. The two streams are stored separately.

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" }

Share a 'screen'-session
Ater person A starts his screen-session with `screen`, person B can attach to the srceen of person A with `screen -x`. Good to know, if you need or give support from/to others.


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