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Accepted
abbasi_ahsan
Asked: 2019-08-28 05:37:32 +0800 CST

How to merge two files' data line by line?

  • 772

I have two files, and want to merge data line by line. The input files are file.txt and file2.txt.

file1.txt

howareu
abc
zooo

file2.txt

123
@@
099

I want to merge the two file, such that output will be:

output.txt

howareu123
howareu@@
howareu0999
abc123
abc@@
abc0999
zooo123
zooo@@
zooo0999

Is there way to do that? Is there a way to use the sed or paste command to obtain the result?

files merge text-processing

2 Answers

  1. Best Answer

    There's usually some elegant way to do a task, but you may spend more time looking for it than just brute force. Not using sed or paste (just shell builtins):

    #!/bin/bash
while read line1
do
  while read line2
  do
    echo ${line1}${line2}
  done <file2.txt
done <file1.txt
    • 1

  2. So long as file2.txt is not too large, I'd suggest awk:

    $ awk 'NR==FNR {a[FNR] = $0; next} {for(i=1;i in a;i++) print $0 a[i]}' file2.txt file1.txt
howareu123
howareu@@
howareu099
abc123
abc@@
abc099
zooo123
zooo@@
zooo099
    • 1