A quick tutorial on AWK command | Latest | Engineer

Published: 30 April 2020
on channel: Engineerhoon

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Watch the latest (2021) tutorial on AWK command:    • Video

AWK command

Actions:

This command is mostly used for pattern scanning and processing. It allows us to use variables, logical operations, numeric and string functions, etc.

Syntax:

awk 'pattern { actions } ' inputfile

Some built-in variables :

NR - Keeps the current count of the number of records
NF - Keeps the current count of the number of fields within the current input field
FS - Field Separator
RS - Record separator
ORS - Output Record Separator (Default ORS is newline)
OFS - Output Field Separator (Default ORS is blank space)

Below are some commands using awk:

awk '{print}' testfile.txt

awk '/TCS/{print}' testfile.txt

awk '/TCS/{print $1}' testfile.txt

awk '/TCS/{print $0}' testfile.txt

awk '/TCS/{print NR,$0}' testfile.txt

awk '{print NR,$0}' testfile.txt

awk '{if($4=="TCS")}{print NR,$0}' testfile.txt

awk '{if($4=="TCS")} END{print NR,$0}' testfile.txt

awk '{print $1,NF}' testfile.txt

awk '{print $1,$NF}' testfile.txt

awk '{print $1,$(NF-1)}' testfile.txt

awk 'NR==3, NR==4{print $1,$(NF-1)}' testfile.txt

awk 'NR==3, NR==6{print $1,$(NF-1)}' testfile.txt

awk '{print $1 ":"$(NF-1)}' testfile.txt

awk '{print $1,$(NF-1)}' testfile.txt

awk 'BEGIN{OFS=":";}{print $2,$NF}' testfile.txt

awk 'BEGIN{ORS=":";}{print $2,$NF}' testfile.txt

awk 'BEGIN{ORS="\n\n\n";}{print $2,$NF}' testfile.txt

awk '{print $2,$NF}' testfile.txt

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