Question 27060 in CentOS Question posted in
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bash script for take same lines from 2 different file – CentOS

I’ve for example file called users and it’s include

user1
user2
user3

and file called newusers including:

newuser1
newuser2
newuser3

and now I need bash script for take user1 and newuser1 and do some command for example ‘mv user1 to newuser1’ and etc.
something like this but this is not working for me:

user=cat users
newuser= cat newusers

for u in user ; for n in newuser; do mv $u $n done; done
Tags:

2

Answers


  1. 0

    If you nest the two loops, you get "number of users" * "number of newusers" move operations. But you want only "number of users" move operations.

    Pure Bash:

    #! /bin/bash

exec {users}<users
exec {newusers}<newusers

while true; do
  read user <&$users || exit
  read newuser <&$newusers || exit
  mv "$user" "$newuser"
done
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  2. 0

    Provided the files are in matching order, and the same number of lines:

    tab=$(printf 't')

paste users newusers |
while IFS=$tab read user newuser; do
    echo "move $newuser $user"
done

    It works in bash or sh. You can build a command using the corresponding lines. The lines can’t already contain tabs.

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