There are several ways to read a file in loop, here are few of them with examples

consider my input file is as below

FileName: file1

File Content:

A B C
D E F
G H I
J … Read the rest

for example, i have a text file like below

test1 test2
test3 test4
test5 test6

i want my text file to look like as below

test1,test2
test3,test4
test5,test6

use below sed function to achieve the result.

sed -e 's/\s+/,/g' old … Read the rest