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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" }

Get and read log from remote host (works with log on pipe, too)

Print IP of any interface. Useful for scripts.

get all Google ipv4/6 subnets for a iptables firewall for example (updated version)
google has added 2 more netblocks...

Show one line summaries of all DEB packages installed on Ubuntu based on pattern search
I sometimes want to know what packages are installed on my Ubuntu system. I still haven't figured out how to use aptitude effectively, so this is the next best thing. This allows finding by name. The grep '^ii' limits the display to only installed packages. If this is not specified, then it includes listing of non-installed packages as well.

delete all trailing whitespace from each line in file

Selecting a random file/folder of a folder
random file from files in directory

Extract title from HTML files
previous version leaves lots of blank lines

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Find if $b is in $a in bash
Find if $b is in $a in bash


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