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  1. #!/bin/bash
  2.  
  3. target=3
  4. string="yowza"
  5.  
  6. sed "${target}i\\
  7. $string" /etc/shells
  8.  
  9. awk -v n="$target" -v s="$string" '
  10. NR==n { print s } 1' /etc/shells
  11.  
  12. perl -ple 'BEGIN { $n = shift @ARGV;
  13.     $s = shift @ARGV } { print $s if $. == $n }' "$target" "$string" /etc/shells
Success #stdin #stdout 0.01s 5436KB
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Standard input is empty
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# /etc/shells: valid login shells
/bin/sh
yowza
/bin/bash
/usr/bin/bash
/bin/rbash
/usr/bin/rbash
/bin/dash
/usr/bin/dash
/usr/bin/tmux
/usr/bin/screen
# /etc/shells: valid login shells
/bin/sh
yowza
/bin/bash
/usr/bin/bash
/bin/rbash
/usr/bin/rbash
/bin/dash
/usr/bin/dash
/usr/bin/tmux
/usr/bin/screen
# /etc/shells: valid login shells
/bin/sh
yowza
/bin/bash
/usr/bin/bash
/bin/rbash
/usr/bin/rbash
/bin/dash
/usr/bin/dash
/usr/bin/tmux
/usr/bin/screen
https://ideone.com/st9h6l
https://stackoverflow.com/questions/72805923/how-to-use-a-script-to-add-a-line-to-a-specific-line-number-in-another-script-fi
language:
Bash (bash 5.0.3)
created:
3 years ago
visibility:
secret

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