Shell Data Processing - Awk (grep and sed) - Output filtering

About

The awk command is a filter that implements a language that is dedicated to text processing and combines the functions of:

• grep
• and sed

AWK is a (tool|language) for event-based data processing.

Management

Function

http://www.math.utah.edu/docs/info/gawk_13.html

Example

ls

Ls with only acl information.

ls -l | grep pls.txt |  awk '{print $1, $2, $3, $4}'

-rw-rw---- 1 oracle oinstall

To get the cached memory

With the free command:

[oracle@Exalytics-01 ~]$ free | grep Mem | awk '{print $7}'

137329856

[oracle@Exalytics-01 ~]$ free

total       used       free     shared    buffers     cached
Mem:    1058964444 1011201796   47762648          0    1272644  137329872
-/+ buffers/cache:  872599280  186365164
Swap:    101023736       4392  101019344

Escape

Example on how to escape the :

awk '{print $1"\:"$2}'

Documentation / Reference

• Documentation reference - The GNU Awk User’s Guide