Photos
-
Tag Cloud
android awk bash bioservices books C CSS dictionary english fedora Firefox gimp git github graphviz HTML ipython latex Linux malloc matplotlib mount pandas PDF perl PHP pypi python R rest rpy rpy2 samtools sed sphinx ssh svn video vim virtualbox virtualenv web services wget xbmc yum
WP Cumulus Flash tag cloud by Roy Tanck requires Flash Player 9 or better.
Follow me
-
Recent Posts
calendar
Recent Comments
- Thomas Cokelaer on matplotlib: difference between pcolor, pcolormesh and imshow
- Thomas Cokelaer on Difference between __repr__ and __str__ in Python
- Thomas Cokelaer on corrplot function in Python
- TGray on gimp: how to make a transparent background
- Janine on HTML: how to insert HTML code in a verbatim tag <pre>
Archives
- October 2018
- August 2018
- May 2018
- March 2018
- February 2018
- January 2018
- December 2017
- October 2017
- September 2017
- August 2017
- June 2017
- May 2017
- January 2017
- November 2016
- October 2016
- September 2016
- March 2016
- February 2016
- January 2016
- June 2015
- May 2015
- February 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- April 2014
- March 2014
- February 2014
- January 2014
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- July 2012
- June 2012
- April 2012
- March 2012
- February 2012
- January 2012
- November 2011
- October 2011
- September 2011
- August 2011
- July 2011
- June 2011
- May 2011
- April 2011
- March 2011
Categories
Meta
Tag Archives: awk
AWK: convert into lower or upper cases
Tweet In order to convert a bash variable to lower case with awk, just use this command:
|
1 2 |
a="UPPER CASE" echo "$a" | awk '{print tolower($0)}' |
If you want to convert the content of a file (called data.csv) to lower case:
|
1 |
awk '{print tolower($0)}' data.csv |
Of course to convert into upper … Continue reading
swapping two columns with awk keeping tabulation
Tweet Assuming you have a data file with N columns and you want to swap the first and second one, just type:
|
1 |
awk -F $'\t' ' { t = $1; $1 = $2; $2 = t; print; } ' OFS=$'\t' input_file |
To keep the tabulation intact, you need to specify the separator. Incoming separator is defined by -F … Continue reading
How to calculate mean in AWK
Tweet Another trick with awk to compute mean of a column. Imagine that you have a file with many lines and you want to compute the mean of the fourth item on each line. E.g:
|
1 2 3 |
Lowest value found .2 Lowest value found .4 Lowest value found .6 |
Using the awk tool … Continue reading
How to resize images with awk and convert
Tweet If photos in a directory are too large, you may want to use a script to automatically convert all the files into another format. AWK and convert tools can help you. The following command should convert all the files … Continue reading
Combine AWK and SED to create symbolic links
Tweet The unix tools AWK and SED are very powerful tools to manipulate files and perform text processing tasks. It’s true that the syntax is not always very intuitive but it can help you in performing task in a single … Continue reading
AWK: the substr command to select a substring
Tweet Under Linux, the awk command has quite a few useful functions. One of them, which is called substr, can be used to select a substring from the input. Here is its syntax: substr(s, a, b) : it returns b … Continue reading
Awk: how to convert PNG files into PDF
Tweet Here is a method to convert a bunch of PNG files into another format (here PDF). This method works under linux and uses both awk and convert commands (the conversion is made with the convert command). The following script … Continue reading