Commands tagged random (98)

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Run a command as root, with a delay
$ sleep 1h ; sudo command or $ sudo sleep 1h ; sudo command won't work, because by the time the delay is up, sudo will want your password again.

Simple Comment an entire file
With this simple sed command we can easily comment and entire file.

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

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" }

regex for turning a URL into a real hyperlink (i.e. for posting somewhere that accepts basic html)
This should work with anything://url.whatever etc etc ;)

Show which programs are listening on TCP and UDP ports
-p Tell me the name of the program and it's PID -l that is listening -u on a UDP port. -n Give me numeric IP addresses (don't resolve them) -t oh, also TCP ports

check open ports without netstat or lsof

Stream YouTube URL directly to mplayer
The original doesn't work for me - but this does. I'm guessing that Youtube updated the video page so the original doesn't work.

which procs have $PATH_REGEX open?
faster than lsof by at least x2 on my box.

List your MACs address
The output of ifconfig is localized, using it will fail in non-English environment. "ip" command in iproute2 provides a consistent output and thus is more robust


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