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Comand line text processing
= Comand line text processing =
Examples:
Examples:
<source lang="bash">
<source lang="bash">
</source>
</source>
Print from 3rd field till end
== Print from 3rd field till end ==
<source lang="bash">
<source lang="bash">
awk '{ \
awk '{ \
== Print with condition ==
== Print with condition ==
awk '{if ($3 =="" || $4 == "" || $5 == "") print "Some score for the student",$1,"is missing";'}' student-marks
awk '{if ($3 =="" || $4 == "" || $5 == "") print "Some score for the student",$1,"is missing";'}' student-marks
== Print columns as lines ==
ls -lR | awk '{for(x=1;$x;++x) print $x}'
<nowiki>awk '{for(x=1;$x;x++)print $x}'
___ __ ___
| | |
| | |-----> increment x by 1 at the end of each loop.
| |--------> run the loop as long as there is a field number x
|------------> initialize x to 1</nowiki>