tee to a file descriptor

2010-08-13 1 min read Bash Linux

1

$ tee >(cat &#8211; >&2)

the tee command does fine with file names, but not so much with file descriptors, such as &2. This uses process redirection to tee to the specified descriptor.

In the sample output, it’s being used to tee to stderr, which is connected with the terminal, and to wc -l, which is also outputting to the terminal. The result is the output of bash –version followed by the linecount

Paste clipboard is bash or shell scripts with modification.

2010-07-20 1 min read Bash Linux

Today I had a issue where I wanted to paste the clipboard to a shell script after removing the spaces. So, I went hunting for a way to do this. Finally I came up with this:

sudo yum install xclip

Then you can paste the clipboard content using ”xclip -o”. So now the problem is reduced to selecting the required info and doing :

xclip -o |sed ’s/ //g’
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CLI Color and bash prompt.. some colored fun with prompts in bash

2010-06-29 5 min read Bash Fedora Linux

There are two ways to do it, one is with tput command. We will see that some other time, today we will consider the escape sequence way.

First we need to understand the colors as understood by bash. Some time back a fried of mine gave me this little script to find the colors. You can download it <a href="http://blog.amit-agarwal.co.in/2009/03/bash_colors" target="_blank">Script bash colors. Here is the script

#!/bin/bash

T=’amit agarwal’ # The test text
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Getting your wordpress self hosted stats on your console with bash script.

2010-06-29 3 min read Bash Learning

Some time back I wrote a blog on how to get your site stats using curl in <a class="zem_slink freebase/en/bash" title="Bash" rel="homepage" href="http://tiswww.case.edu/php/chet/bash/bashtop.html">bash shell. Today we will use the same script to get the stats every few seconds on the terminal on the same line, similar to progress meter.

Here is the script and the description:

  <td>
    <div class="bash codecolorer">
      <span class="co0">#!/bin/bash -</span><br /> <span class="co0">#===============================================================================</span><br /> <span class="co0">#</span><br /> <span class="co0">#          FILE:  update_stats.sh</span><br /> <span class="co0">#</span><br /> <span class="co0">#         USAGE:  ./update_stats.sh</span><br /> <span class="co0">#</span><br /> <span class="co0">#   DESCRIPTION:  Update the stats inline in shell every $1 seconds.</span><br /> <span class="co0">#</span><br /> <span class="co0">#       OPTIONS:  ---</span><br /> <span class="co0">#  REQUIREMENTS:  ---</span><br /> <span class="co0">#          BUGS:  ---</span><br /> <span class="co0">#         NOTES:  ---</span><br /> <span class="co0">#        AUTHOR:  <a class="zem_slink" title="Amit Agarwal" rel="homepage" href="http://amit-agarwal.co.in">Amit Agarwal</a> (AKA), amit.agarwal@amit-agarwal.co.in</span><br /> <span class="co0">#       COMPANY:  Individual</span><br /> <span class="co0">#       VERSION:  1.0</span><br /> <span class="co0">#       CREATED:  06/21/2010 11:27:16 PM IST</span><br /> <span class="co0">#      REVISION:  ---</span><br /> <span class="co0">#===============================================================================</span><br /> <br /> <span class="re2">sleep_time</span>=<span class="nu0">30</span> <span class="co0">#the time to wait between stats collection</span><br /> <span class="re2">run_stats</span>=get_stats  <span class="co0"># the script to run to get the stats</span><br /> <span class="re2">filename</span>=<span class="sy0">/</span>tmp<span class="sy0">/</span>statpress.html <span class="co0"># the filename where the script is storing the html file of your statpress page.</span><br /> <span class="kw3">eval</span> <span class="re1">$run_stats</span> <span class="nu0">2</span><span class="sy0">><</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/dev_null"</span> <span class="re2">title</span>=<span class="st0">"/dev/null"</span> <span class="re2">rel</span>=<span class="st0">"wikipedia"</span> <span class="re2">href</span>=<span class="st0">"http://en.wikipedia.org/wiki//dev/null"</span><span class="sy0">>/</span>dev<span class="sy0">/</span>null<span class="sy0"></</span>a<span class="sy0">></span><br /> <span class="kw1">while</span> <span class="br0">&#40;</span><span class="kw2">true</span><span class="br0">&#41;</span><br /> <span class="kw1">do</span><br /> <span class="sy0"><!</span>--loginview start--<span class="sy0">></span><span class="re2">values</span>=$<span class="br0">&#40;</span><span class="kw2">cat</span> <span class="re1">$filename</span> <span class="sy0">|</span> w3m <span class="re5">-dump</span> <span class="re5">-T</span> <span class="sy0"><</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/html"</span> <span class="re2">title</span>=<span class="st0">"HTML"</span> <span class="re2">rel</span>=<span class="st0">"wikipedia"</span> <span class="re2">href</span>=<span class="st0">"http://en.wikipedia.org/wiki/HTML"</span><span class="sy0">></span>text<span class="sy0">/</span>html<span class="sy0"></</span>a<span class="sy0">></span> <span class="sy0">|<</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/grep"</span> <span class="re2">title</span>=<span class="st0">"Grep"</span> <span class="re2">rel</span>=<span class="st0">"wikipedia"</span> <span class="re2">href</span>=<span class="st0">"http://en.wikipedia.org/wiki/Grep"</span><span class="sy0">></span><span class="kw2">grep</span><span class="sy0"></</span>a<span class="sy0">></span> <span class="st0">"^Visitor\\|^Pageviews"</span><span class="sy0">|<</span>a <span class="re2">class</span>=<span class="st0">"zem_slink freebase/en/awk"</span> <span class="re2">title</span>=<span class="st0">"AWK"</span> <span class="re2">rel</span>=<span class="st0">"homepage"</span> <span class="re2">href</span>=<span class="st0">"http://cm.bell-labs.com/cm/cs/awkbook/index.html"</span><span class="sy0">></span><span class="kw2">awk</span><span class="sy0"></</span>a<span class="sy0">></span> <span class="co3">\'</span><span class="br0">&#123;</span>print <span class="re4">$1</span><span class="nu0"></span><span class="br0">&#125;</span><span class="co3">\'</span><span class="sy0">|</span><span class="kw2">tr</span>  <span class="st0">"\<span class="es1">\n</span>"</span> <span class="st0">" "</span><span class="br0">&#41;</span><br /> <span class="re2">time</span>=$<span class="br0">&#40;</span><span class="kw2">date</span><span class="br0">&#41;</span><br /> <span class="kw3">printf</span> <span class="st0">"<span class="es2">$time</span> --> <span class="es2">$values</span> \<span class="es1">\r</span>"</span><span class="sy0"><!</span>--loginview end--<span class="sy0">></span><br /> <span class="kw2">sleep</span> <span class="re1">$sleep_time</span><br /> <span class="kw1">done</span>
    </div>
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for loop in bash script on solaris without seq (amit-agarwal.co.in)
Get the mappings from tex file for vim plugins (amit-agarwal.co.in)
unbound variable – bash completion not working and having issues with other stuff like command not found. (amit-agarwal.co.in)
bash builtins (almirkaric.com)

$\"Enhanced$

Delete Files older than 14 days

2010-06-25 1 min read Bash Linux

Taken from Dzone.

@echo on

setlocal

set srcDir=.

Read more: <a href="http://snippets.dzone.com/posts/show/10441">http://snippets.dzone.com/posts/show/10441

Magic space on the current command line

2010-06-25 1 min read Bash Fedora Linux

# For how to set up magic space for Bash see:
# – http://www.ukuug.org/events/linux2003/papers/bash_tips/#slide15
# – http://codesnippets.joyent.com/posts/show/1690

man bash 2>/dev/null | less -p ’magic-space’

man bash 2>/dev/null | less -p ’Event Designators’

man bash 2>/dev/null | less -p ’\!#’ # ”The entire <a class="zem_slink" title="Command-line interface" rel="wikipedia" href="http://en.wikipedia.org/wiki/Command-line_interface">command line typed so far.”

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bash one liner to change/remove test pattern from config file or text file.

2010-06-25 1 min read Bash Fedora Learning Linux

Problem:

I had a directory with a lot of config files in the ini file format, i.e. name and value separated by equals. Some/all of these contained some directory names and other values which had to be replaced. But there were other place where I should not not replace them, if there was no exact match. I also needed to have a backup copy of the file that I was modifying. Since the number of files that I needed to change was multiple so was quite difficult to do it without using some script.