Find when debian packages were installed on a system.

A quick and simple way of outputting the start and end date of a certificate, you can simply use 'openssl x509 -in xxxxxx.crt -noout -enddate' to output the end date (ex. notAfter=Feb 01 11:30:32 2009 GMT) and with the date command you format the output to an ISO format.

For the start date use the switch -startdate and for end date use -enddate.

I use this to make skype blend better into my desktop :)

--disable-cleanlooks might not be nescessary to achieve the wanted effect.

205413

real 0m0.497s

user 0m0.220s

sys 0m0.268s

205413

real 0m3.776s

user 0m3.340s

sys 0m0.424s

*********

** EDIT: turns out this perl liner is mostly masturbation. this is slightly faster:

sh-3.2$ time { find . -maxdepth 1|wc -l; }

205414

real 0m0.456s

user 0m0.116s

sys 0m0.328s

** EDIT: now a slightly faster perl version

sh-3.2$ time perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"'

205414

real 0m0.415s

user 0m0.176s

sys 0m0.232s

Add to your bash profile to minimize carpal tunnel syndrome.

Doesn't work with user@hostname but appending "-l user" works fine if needed.

Works for ping as well..

complete -W "$(echo `cat ~/.ssh/known_hosts | cut -f 1 -d ' ' | sed -e s/,.*//g | uniq | grep -v "\["`;)" ping

Convert comma separated files to tab separated files.

(MySQL eats tab separated files with much less instruction than comma seperated files.)

substitute the URL with your private/public XML url from calendar sharing settings

substitute the dates YYYY-mm-dd

adjust the perl parsing part for your needs

I tried out on my Mac, jot to generate sequence ( 0,25,50,..), you can use 'seq' if it is linux to generate numbers, need curl installed on the machine, then it rocks.

@Satya

prints a random line

Fetches the IPs and ONLY the IPs from ifconfig. Simplest, shortest, cleanest.

Perl is too good to be true...

(P.S.: credit should go to Peteris Krumins at catonmat.net)

Limited, but useful construct to extract text embedded in XML tags. This will only work if bar is all on one line.

If nobody posts an alternative for the multiline sed version, I'll figure it out later...

If you use 'tail -f foo.txt' and it becomes temporarily moved/deleted (ie: log rolls over) then tail will not pick up on the new foo.txt and simply waits with no output.

'tail -F' allows you to follow the file by it's name, rather than a descriptor. If foo.txt disappears, tail will wait until the filename appears again and then continues tailing.

Add this to your $HOME/.bashrc file. It will only set this prompt if it is running inside screen ($WINDOW var is set)

Looks like this...

Breaks down and numbers each line and it's fields. This is really useful when you are going to parse something with awk but aren't sure exactly where to start.

Directly attach a remote screen session (saves a useless parent bash process)

command to decrypt:

Of course, don't forget to rm the original files ;) You may also want to look at the openssl docs for more options.

This executes faster than

I put this in a script and added it to my path:

#!/bin/bash

if [ $# -eq 0 ]; then

explorer.exe $( cygpath `pwd` -w ) &

else

explorer.exe $( cygpath $1 -w ) &

fi;

Using the script you just type

Note: you can do this for any file that has an associated executable in the windows registry. This is quite handy if you want to open pictures or movies from xterm.

converts any number on the 'stdin' to SI notation. My version limits to 3 digits of precious (working with 10% resistors).

a shorter version

This command finds the 5 (-n5) most frequently updated logs in /var/log, and then does a multifile tail follow of those log files.

Alternately, you can do this to follow a specific list of log files:

sudo tail -n0 -f /var/log/{messages,secure,cron,cups/error_log}

Instead of calculating the offset and providing an offset option to mount, let lomount do the job for you by just providing the partition number you would like to loop mount.

Shows a single line per interface (device), with its IPv4 settings.

Shorter command, better readability in output.

a variation of avi4now's command - thanks by the way!