Tag Archive for 'AWK'

It doesn’t fit all jobs

Published
by
Carlo
on March 3, 2008
in English
. 0 Comments

Reading the referers of this website, I found that someone reached it querying a search engine for

using AWK to find zero length files

AWK is a great tool but IMHO that is not its job.

I would have used a simple
find -size 0b

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AWK, the summer :)

Published
by
Carlo
on November 30, 2007
in English
. 1 Comment

Sorry, I’m addicted to puns. :)
This is a note for me, you and Michele: do you want to get the sum of a set of integers? Try this one-liner:

awk '{TOT += $0} END {print TOT}' your_filename

Use $0 if your_filename has lines with one integer each, of course you can use $another_integer if you want to get the sum from a given column.

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Exporting changed only files with Subversion

Published
by
Carlo
on August 30, 2007
in English
. 0 Comments

Reading the referers of this website, I found that someone reached it querying a search engine for

subversion or svn export only changed files

This one-liner (that can be easily turned into a subversion hook) could do the task

for i in `svn log -r HEAD -v | grep "^ [MA]” | awk ‘{print $2}’`; do rsync -avR $i /basedir_of_your_export/; done

I’ve previously described here a slightly different problem.

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A Bash-becue recipe :)

Published
by
Carlo
on August 14, 2007
in English
. 2 Comments

Reading the referers of this website, I found that someone reached it querying a search engine for

bash scripting validate file extension

I suppose they were looking for a script that, for example, when it finds a perl file, it is able to recognise it as such even if its extension is not pl.
Well, the following is my recipe for your Ferragosto Bash-becue :)

  1. Using your favourite language, populate an associative array with the strings that file shows for the extensions that you are interested to map. Like: 
    php => PHP script text
pl  => perl script text executable
  2. Within a Bash loop over the folder of your files:
    • run file against each file and save the string that it shows;
    • using awk, extract the extension of each file and look at the associative array: if the associated string is not the same that you have just found then the extension of your file is not validated.
  3. Don’t grill that much, please. :)

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Using AWK to remove file extensions

Published
by
Carlo
on February 16, 2007
in English
. 9 Comments

Reading the referers of this website, I found that someone reached it querying a search engine for

awk remove file extension

Well, it’s definitely easy to achieve it if your files have just a “.” in their names. You can use this one-liner that works inverting the problem :)
# substitute jpg with the extension you need (twice in the line)
for i in $(ls *jpg | awk -F "." '{print $1}'); do mv $i.jpg $i; done

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Finding file extensions with AWK

Published
by
Carlo
on January 30, 2007
in English
. 0 Comments

This one-liner helps in finding the file extensions of a given Subversion working copy:
find path_to_repos -type f | grep -v "/.svn/" | awk -F "/" '{print $NF}' | awk -F "." '{if (NF > 1) {print $NF}}' | sort | uniq

Its usage outside of Subversion is even more trivial.

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