Sometimes you can prefix with "< file". Sometimes, not so much. < /etc/passwd while IFS= read line || [ -n "$line" ]; do printf '%s\n' "$line"; done Meanwhile

Sometimes you can prefix with "< file". Sometimes, not so much. < /etc/passwd while IFS= read line || [ -n "$line" ]; do printf '%s\n' "$line"; done Meanwhile, in ZSH... Meanwhile, in languages that do not need IFS= and || [ -n "$line" ] checks...