bash completion not working on Fedora

2010-06-06 1 min read Bash Fedora Linux

I had bash completion installed and after that I had made huge changes to my bashrc and also installed bashstyle. After this the bash-completion stopped working.

I had to spend a lot of time to figure out that the easiest solution was to source the bash-completion again in the end. 🙂

. /etc/bash_completion

colors in bash -- script to display all the possible colors.

2010-06-06 3 min read Bash Fedora Linux

If you wanted to have colors in the bash output (including the colors in PS1-4), don’t you keep wondering how the color code would look on the terminal. So, I wrote this small script to show the complete color codes. This is how the output would look:

$\"Bash$

And here is the script:

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      #!/bin/bash -<br /> #===============================================================================<br /> #<br /> # &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;FILE: &nbsp;colors.sh<br /> #<br /> # &nbsp; &nbsp; &nbsp; &nbsp; USAGE: &nbsp;./colors.sh<br /> #<br /> # &nbsp; DESCRIPTION: &nbsp;Bash colors<br /> #<br /> # &nbsp; &nbsp; &nbsp; OPTIONS: &nbsp;---<br /> # &nbsp;REQUIREMENTS: &nbsp;---<br /> # &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;BUGS: &nbsp;---<br /> # &nbsp; &nbsp; &nbsp; &nbsp; NOTES: &nbsp;---<br /> # &nbsp; &nbsp; &nbsp; &nbsp;AUTHOR: &nbsp;Amit Agarwal (AKA), amit.agarwal@amit-agarwal.co.in<br /> # &nbsp; &nbsp; &nbsp; COMPANY: &nbsp;Individual<br /> # &nbsp; &nbsp; &nbsp; VERSION: &nbsp;1.0<br /> # &nbsp; &nbsp; &nbsp; CREATED: &nbsp;09/21/2009 06:12:07 PM IST<br /> # &nbsp; &nbsp; &nbsp;REVISION: &nbsp;---<br /> #===============================================================================<br /> <br /> for c in `seq 0 255`;<br /> do<br /> t=5;<br /> [[ $c -lt 108 ]]&&t=0;<br /> for i in `seq $t 5`;<br /> do<br /> #Display the codes also for easier lookup in terminal<br /> <!--loginview start-->echo $i;${c}<!--loginview end--><br /> echo -e "<a class="zem_slink" title="Path (computing)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Path_%28computing%29">\\</a>\e[0;48;$i;${c}m|| $i:$c `seq -s+0 $(($COLUMNS/2))|tr -d \'[0-9]\'`\\e[0m";<br /> done;<br /> done<br /> <br /> # setup_colors - Adds colors to array CC for global use<br /> # 30 - Black, 31 - Red, 32 - Green, 33 - Yellow, 34 - Blue,<br /> # 35 - Magenta, 36 - Blue/Green, 37 - White,<br /> # 30/42 - Black on Green \'30\\;42\'<br /> <!--loginview start-->function setup_colors(){<br /> declare -a CC;<br /> for i in `seq 0 7`;<br /> do<br /> ii=$(($i+7));<br /> CC[$i]="\\033[1;3${i}m";<br /> CC[$ii]="\\033[0;3${i}m";<br /> done;<br /> CC[15]="\\033[30;42m";<br /> R=$\'\\033[0;00m\';<br /> X=$\'\\033[1;37m\';<br /> export R X;<br /> }<br /> function display_colors(){<br /> for i in $(seq 0 $((${#CC[@]} - 1))); do echo -e "${CC[$i]}[$i]\\n$R"; done<br /> }
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unbound variable – bash completion not working and having issues with other stuff like command not found. (amit-agarwal.co.in)
Modifying the bashrc or bash startup files. (amit-agarwal.co.in)
Nature-Inspired Colors for Home Interiors (interiordecorating.suite101.com)
Dark and Light Blue Colors in Feng Shui (feng-shui-concepts.suite101.com)
Delete all files in a folder that don\’t match a certain file extension (amit-agarwal.co.in)

$\"Reblog$

let a cow tell you your fortune

2010-06-03 1 min read Bash Linux

Here\’s something that I saw on commandlinefu yesterday. That sent me thinking about some command to have the cow file picked randomly 🙂 So, here\’s the original command from the commandlinefu:

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        $ fortune | <a class="zem_slink freebase/en/cowsay" title="Cowsay" rel="homepage" href="http://www.nog.net/%7Etony/warez/cowsay.shtml">cowsay</a> -f tux
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Let Tux bring the fortune cookie

Google\’s RE2 regular expression library

2010-05-30 0 min read Bash

$\"Image$: Image via CrunchBase

<a class="zem_slink freebase/en/google" title="Google" rel="homepage" href="http://google.com">Google has announced the release of its RE2 library under a BSDish license. ”At Google, we use <a class="zem_slink freebase/en/regular_expression" title="Regular expression" rel="wikipedia" href="http://en.wikipedia.org/wiki/Regular_expression">regular expressions as part of the interface to many external and internal systems, including Code Search, <a class="zem_slink freebase/en/sawzall" title="Sawzall (programming language)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Sawzall_%28programming_language%29">Sawzall, and <a class="zem_slink" title="Bigtable" rel="homepage" href="http://labs.google.com/papers/bigtable.html">Bigtable. Those systems process large amounts of <a class="zem_slink freebase/en/data" title="Data" rel="wikipedia" href="http://en.wikipedia.org/wiki/Data">data; exponential <a class="zem_slink freebase/en/runtime" title="Run time (computing)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Run_time_%28computing%29">run time would be a serious problem. On a more practical note, these are <a class="zem_slink freebase/en/thread" title="Thread (computer science)" rel="wikipedia" href="http://en.wikipedia.org/wiki/Thread_%28computer_science%29">multithreaded <a class="zem_slink freebase/en/cplusplus" title="C++" rel="wikipedia" href="http://en.wikipedia.org/wiki/C%2B%2B">C++ programs with fixed-size stacks: the unbounded stack usage in typical regular expression implementations leads to stack overflows and server crashes. To solve both problems, we’ve built a new regular expression engine, called RE2, which is based on <a class="zem_slink freebase/en/automata_theory" title="Automata theory" rel="wikipedia" href="http://en.wikipedia.org/wiki/Automata_theory">automata theory and guarantees that searches complete in <a class="zem_slink freebase/en/linear_time" title="Linear time" rel="wikipedia" href="http://en.wikipedia.org/wiki/Linear_time">linear time with respect to the size of the input and in a fixed amount of stack space.” More information can be found on the <a href="http://code.google.com/p/re2/" target="_blank">RE2 project page.<h6 class="zemanta-related-title">Related articles by Zemanta <ul class="zemanta-article-ul"> <li class="zemanta-article-ul-li"><a href="http://glinden.blogspot.com/2010/03/gfs-and-its-evolution.html">GFS and its evolution (glinden.blogspot.com) <li class="zemanta-article-ul-li"><a href="http://research.swtch.com/2010/03/regular-expression-article-3.html">Regular Expression Article #3 (research.swtch.com) <div class="zemanta-pixie"><a class="zemanta-pixie-a" title="Reblog this post [with Zemanta]" href="http://reblog.zemanta.com/zemified/456fa268-f416-4aec-ae05-4d1a9c9c2712/"><img class="zemanta-pixie-img" src="http://blog.amit-agarwal.co.in/wp-content/uploads/2010/08/reblog_b65.png" alt="Reblog this post [with Zemanta]" /><span class="zem-script more-related more-info pretty-attribution paragraph-reblog">

prints line numbers

2010-05-27 1 min read Bash

$ nl

others:
perl -ne ’print ”$. – $_”’ $1
grep -n . $1
perl -pe ’print ”$. ”’ $1
cat -n $1

<a href="http://www.commandlinefu.com/commands/view/4273/prints-line-numbers">View this command to comment, vote or add to favourites
<a href="http://feeds2.feedburner.com/commands/by/solarislackware">View all commands by <a href="http://feeds2.feedburner.com/commands/by/solarislackware">solarislackware

by David Winterbottom (<a href="http://codeinthehole.com">codeinthehole.com)

Pimp your ls

2010-05-27 1 min read Bash

Here are some of the things that you can do with your ls command.

First off you can use alias’s to help you type the most typical ls commands. I will give you some examples:

alias ls =”ls –color –classify”
alias ls.=”ls -d .*”

Very commonly used :

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      alias ll="ls -lhvrt"<br /> lsd="ls -lUd */" # List directories only
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And after all this you can download the l script from pixelbeat. Quite interesting:

more powerful grep – ack

2010-05-26 2 min read Bash Fedora

For last couple of days, I have been using ack instead of grep. Here is description of ack:

Ack is designed as a replacement for grep.

There are couple of reasons I am using ack. First and foremost being it does not require a filename. So, for seaching amit in all files recursively under the current directory I can simply use

ack amit

More reasons to use ack:

It supports pager option and there can be a rc file that can be used to define the default options that needs to be used with ack. Here is the contents of my $HOME/.ackrc file.

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