Commands by CoolHand

Commands by CoolHand (1)

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Print a cron formatted time for 2 minutes in the future (for crontab testing)

usage = crontest "/path/to/bin" This version of this function will echo back the entire command so it can be copied/pasted to crontab. Should be able to be automagically appended to crontab with a bit more work. Tested on bash and zsh on linux,freebsd,aix Show Sample Output
This is sample output - yours may be different.
```
49 15 12 03 *   /path/to/bin
```
0

crontest () { date +'%M %k %d %m *' |awk 'BEGIN {ORS="\t"} {print $1+2,$2,$3,$4,$5,$6}'; echo $1;}

CoolHand · 2015-03-12 19:56:56 2

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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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