Empty a file

This one is for those who know the “touch” command. Hope all of us do not follow a  command just because it is on one of the popular site without trying to understand the command and the output.

Repeat a portrait eight times so it can be cut out from a 6″x4″ photo and used for visa or passport photos

Repeat a portrait eight times so it can be cut out from a 6″x4″ photo and used for visa or passport photos

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      montage 2007-08-25-3685.jpg +clone -clone 0-1 -clone 0-3 -geometry 500 -frame 5 output.jpg
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Yes, You could do it in the GIMP or even use Inkscape to auto-align the clones, but the command line is so much easier.

intercept stdout/stderr of another process or disowned process

The command is definately going to save your day if you have disowned the process by mistake. Only uses strace so might as well work on Solaris also, though not tried it.

intercept stdout/stderr of another process or disowned process

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      strace -e write=1,2 -p $PID 2>&1 | sed -un "/^ |/p" | sed -ue "s/^.{9 }(.{50}).+/1/g" -e 's/ //g' | xxd -r -p
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Useful to recover a output(stdout and stderr) “disown”ed or “nohup“ep process of other instance of ssh.

Using SQLite to maintain your monthly bills.

I was looking for a small application to maintain my every month bills. The application had to be small and script-able. I basically wanted to keep track of the bills that have been generated and pending payment and the bills that have been paid.

First we will create the <a class="zem_slink" title="Database" rel="wikipedia" href="http://en.wikipedia.org/wiki/Database">database schema with the following command:

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      CREATE TABLE bills(name varchar(20), due_dt text, p_dt text, amount integer);
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So, I built on the knowledge gathered on <a class="zem_slink" title="SQLite" rel="homepage" href="http://sqlite.org/">SQLite. And here is a small script that I wrote:

SQLite – simple use in scripts

Today we will look a the most simple use&#8217;s in the scripts and how to use them.

echo &#8221;insert into bills values (&#8221;$name&#8221;,$date_now, $date_now,$1)&#8221;|sqlite bills

or the other way to do this is

<a class="zem_slink" title="SQLite" rel="homepage" href="http://sqlite.org/">sqlite3 bills &#8221;insert into bills values (&#8221;$name&#8221;,$date_now, $date_now,$1)&#8221;

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