Shell Control Statements


In shell conditionals, the expression is a command
Success (exit 0) makes the condition true
Even "[" is a command

if <cmd>; then <cmd> [; <cmd> ...]; fi

while <cmd>; do <cmd> [; <cmd> ...]; done

"for" and "case", on the other hand, loop on strings

for n in <list>; do <cmd> [; <cmd> ...]; done

case <str> in
      <glob>) <cmd> ;;
      <glob>) <cmd> ;;
esac