POSIX shell error-handling with set -e

output.txt

# ./test.sh
140529043738688:error:20087002:BIO routines:BIO_lookup:system lib:../crypto/bio/b_addr.c:694:Name or service not known
connect:errno=2
else branch - ignored error - output: foo
command output:
bar
140510615253056:error:20087002:BIO routines:BIO_lookup:system lib:../crypto/bio/b_addr.c:694:Name or service not known
connect:errno=2
entered loop - ignored error
bar
140520604876864:error:20087002:BIO routines:BIO_lookup:system lib:../crypto/bio/b_addr.c:694:Name or service not known
connect:errno=2
script complete

test.sh

set -e

err() {
  echo "$1"
  printf "GET \foo\bar\n\n" | openssl s_client -connect puppet:8140 -ign_eof -quiet
  return 1
}

output="none"
if output=$(err "foo") > ./output.txt; then
  echo "if branch - ignored error - output: $output"
else
  echo "else branch - ignored error - output: $output"
fi

exitloop=false
while ! (err "bar" || $exitloop); do
  echo "entered loop - ignored error"
  exitloop=true
done 

echo "script complete"