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I have a multiline string and I want it first to be formatted to specific length per line before passing each line to a function for line processing.

e.g.

description="\
    NOTE: 
    This script should be run on a newly created server. 

    However it can also be re-run selectively even afterwards, to re configure your settings if they were messed up.

    Ready to configure the server for the first time.
"
echo "$description" | fmt -w 80 

I want to now iterate through the output of the above and send each line to a function.

What I imagine is something like this (which does not work):

function testme() {
  for var in "$@"
  do
      echo "$var"
  done
}
echo "$description" | fmt -w 80 | testme 

Any ideas?

  • for starters, maybe you want to reconsider your function name: test is a shell builtin, and a program at /usr/bin/test – matsib.dev May 24 at 23:31
  • Thanks. will modify. – conanDrum May 24 at 23:33
  • You could get rid of echo and just use here-doc structure. fmt reads stdin with no file specified, so using heredoc should be close enough to a pipe. In fact in some shells, I believe dash, heredoc is implemented as anonymous pipe – Sergiy Kolodyazhnyy May 25 at 0:11
1

Try this way:

function testme() {
  while IFS='' read line
  do
      echo "$line"
  done
}
echo "$description" | fmt -w 80 | testme
  • Works but loses the formatting. Can we retain format? – conanDrum May 24 at 23:37
  • Similarly but using arguments, function testme() { for var in "$@" do echo ">>> $var" done } export -f testme echo "$description" | fmt -w 80 | xargs -n 1 -P 10 -I {} bash -c 'testme "$@"' _ {} This also loses format. But also loses empty lines. – conanDrum May 24 at 23:44
  • I've made a little mod: try now – matsib.dev May 24 at 23:44
  • excellent... How may points can I give you?? ))) – conanDrum May 24 at 23:45
  • I've made another little, but important mod; now is better: use this one instead. – matsib.dev May 24 at 23:52

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