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= Built In Variables = |
= Built In Variables = |
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* Awk’s built-in variables include the field variables—$1, $2, $3, |
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* $0 is the entire line. |
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* NR: current count of the number of lines. |
* NR: current count of the number of lines. |
Revision as of 10:18, 13 April 2019
Basics
- Awk is a scripting language used for manipulating data and generating reports.T
- Usage:
cat stats_collection.log | grep svmem | awk '{print $1 $2," - ",$7}'
Built In Variables
- NR: current count of the number of lines.
awk '{print NR,$0}' employee.txt
- NF: count of the number of fields within the current input record.
awk '{print $1,$NF}' employee.txt awk 'NR==3, NR==6 {print NR,$0}' employee.txt => Display Line From 3 to 6 awk 'END { print NR }' employee.txt => Count the lines in a file
- FS: Field separator character.
The default is “white space”, meaning space and tab characters. FS can be reassigned to another character (typically in BEGIN) to change the field separator.
Examples
- To find/check for any string in any column:
awk '{ if($3 == "B6") print $0;}' geeksforgeeks.txt
- Print lines with more than 10 characters:
awk 'length($0) > 10' employee.txt
- References
{{#widget:DISQUS
|id=networkm
|uniqid=AWK
|url=https://aman.awiki.org/wiki/AWK
}}