Question

i need to parse a number of lines without entering a subshell

cat << EOF | while read -r cmd
sleep 100
sleep 110
sleep 120
EOF

do
    echo $cmd
done

will result:

sleep 100
sleep 110
sleep 120

and it is working, but problem is i need the result outside subshell (be cause i need the results after), tried with for instead of while, but then it won’t parse lines but words:

for cmd in `cat << EOF
sleep 100
sleep 110
sleep 120
EOF`

do
  echo $cmd
done

will result:

sleep
100
sleep
110
sleep
120

so, any ideea how to do that ?

Answer 1

while read -r cmd; do
   echo $cmd
done <<EOF
sleep 100
sleep 110
sleep 120
EOF

Pipes create a subshell. I/O redirection (including here-documents) doesn’t.