Commands by CoolHand (1)

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Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Find the package a command belongs to on Debian

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" }

Change/Modify timestamp interactively

Synchronize date and time with a server over ssh
Set Remote Server Date using Local Server Time (push)

execute a shell with netcat without -e
Shorter version with proper stderr redirection .

Trick find -exec option to execute alias
An alias cannot be executed as command in a find -exec line. This form will trick the command line and let you do the job.

worse alternative to
worse alternative to ctrl+r: grep the history removing duplicates without sorting (case insensitive search).

Find out current working directory of a process

Show used disk space:


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