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[[Category:Linux]]
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= Basics =
Source: [https://www.geeksforgeeks.org/awk-command-unixlinux-examples/ geeksforgeeks.org]
cat stats_collection.log | grep svmem | awk '{print $1 $2," - ",$7}'▼
* Awk is a scripting language used for manipulating data and generating reports.
* Field variables — $1, $2, $3,
* $0 is the entire line.
* 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;}' employee.txt
* Print lines with more than 10 characters:
awk 'length($0) > 10' employee.txt
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;References
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