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That's what grep -i does.


$ cat input.txt
input.txt
-----------
38Nhava
anotherline
Line3

$ grep -i '38NHAVA' input.txt
38Nhava
$ grep -i '38nhava' input.txt
38Nhava

How about something like the following?

input_file.txt

/u1
/u2
/u3



#!/bin/bash

while read line; do
row+=$(echo "$line" | tr '\n' ' ')
done < input_file.txt

nawk -v r=4 -v...