Parse two files input in for/while loop

Question

I have two files with two different values. I want to run a command in loop which needs input from both file. Let me give the example to make it simple.

File1 contents:

google yahoo 

File2 contents:

mail messenger 

I need output like the below

google is good in mail yahoo is good in messenger 

How can I use a for/while loop to achieve the same?

I need a script to:

$File1 needs to replace first result in File1 and $File2 needs to replace first result in File2

/usr/local/psa/bin/domain --create domain $File1 -mail_service true -service-plan 'Default Domain' -ip 1.2.3.4 -login $File2 -passwd "abcghth"

Answer 1

The standard procedure (in Bash) is to read from different file descriptors with the -u switch of read:

while IFS= read -r -u3 l1 && IFS= read -r -u4 l2; do printf '%s is good in %s\n' "$l1" "$l2" done 3<file1 4<file2 

Answer 2

While loop is possible but there is easy way

paste File{1,2} -d% | sed 's/%/ is good in /' 

- % can be any symbol

But if you insist on loop you can use ones offered by gniourf_gniourf or simply dumb underlined

mapfile -t A < File1 mapfile -t B < File2 if [ ${#A[*]} -lt ${#B[*]} ] then L=${#A[*]} else L=${#B[*]} fi n=-1 while [ $[++n] -lt $L ] do printf "%s is good in %s\n" "${A[$n]}" "${B[$n]}" done