Shell Script

Loop

if then fi, while do doneを使う

i=10
while [ $i -le 30 ]; do
     i=`expr $i + 5`
done

i=10
if [ $i -le 30 ]; then
    i=`expr $i + 5`
fi

文字列評価

if [ "_$STR" = "_string" ]; then
fi

入力受付

ans=""
while [ -z "$ans" ]; do
     read ans
     case $ans in
          [Yy]*)
          ;;
          *)
          ;;
     esac
done