Commands by hqnetwork1 (0)

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Calculate the mean or average of a single column of numbers in a text file
single-column-numbers.txt is a text file with 22658 rows (numbers) in a single column. Each number can range from 0 to 134298679.533591 and the dot is for the decimals. This is done with perl because awk can't sum such high numbers.

Preserve colors when piping tree to less

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

Binary search/replace
Replace all instances of "A" with "B" in file "source" saved as file "destination". !! IF A/B is multi-byte, then separate bytes with spaces like so: "s/20\ 0A/00/g".

Revert an SVN file to previous revision
Kudos to xakon.

Set OS X X11 to use installed Mathematica fonts

Find the package that installed a command

Show git branches by date - useful for showing active branches
Print out list of all branches with last commit date to the branch, including relative time since commit and color coding.

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" }

show the date every rpm was installed
the newest rpms are at the top; individual packages can also be queried this way: rpm --last -q package

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