CODEWITHSUNDEEP
linuxbashshellawk
Geroge
Geroge

Reputation: 561

Searching pattern in awk from variable

I have data input data:

AAA
AAA
AA
BBB
BB

I would like to do something like this:

#!/bin/bash

search_pattern=AA

awk '-v search='$search_pattern' /search/ {count ++}END {print count, "/", NR} ' input

Desire output is:

1 / 5

  1. Problem is: when I use variable $search_pattern - awk show output only: / 5

  2. How to "tell" awk to search only AA (not AAA) = force PATTERN to match only whole words

Thank you for any help.

EDIT:

Would be possible to add condition, if does not match any string, print 0 / 5

Upvotes: 1

Views: 1793

Answers (2)

flu
flu

Reputation: 556

Ravinder's solution is correct. Just adding this as another way using pattern matching.

search_pattern=^AA$
awk -v search="$search_pattern" 'BEGIN{count=0} $0 ~ search {count++} END{print count, "/", NR}' input

^ = beginning of the line.

$ = end of the line.

So, AAA would not be counted.

Upvotes: 1

RavinderSingh13
RavinderSingh13

Reputation: 133428

Search will take other strings too which will have this string in them, so try following.

var="AA"    
awk -v VAR="$var" '$0 == VAR{count++;} END{print count " / " NR}'  Input_file

Or with your shown variable names etc.

search_pattern=AA
awk -v search="$search_pattern" '$0 == search {count++}END {print count, "/", NR}' Input_file

EDIT: OP added additional requirement of adding 0 to output if no matches found for string into Input_file, following may help in same.

awk -v search="$search_pattern" '$0 == search {count++}END {print count?count:0, "/", NR}'  Input_file

Upvotes: 3

Related Questions