shell脚本基本语医学习

2019-06-16 02:07栏目:技术创新

#! /bin/sh
#while 语句
echo "enter passwd"
read passwd
while [ $passwd != "aaa" ];do
    echo "sorry try again"
    read passwd
done

#for 语句
#! /bin/bash
for i in a b c; do
    echo "$i\n"
done

#case 语句

#! /bin/sh

echo "Enter a number"
read number
case $number in
    1)
    echo "you number is 1"
    ;;
    2)
    echo "yo number is 2"
    ;;
    *)
    exit 1 
    ;;
esac 

#if else elif fi 

#! /bin/sh

echo "Is it morning? Please answer yes or no."
read YES_OR_NO
if [ "$YES_OR_NO" = "yes" ]; then
  echo "Good morning!"
elif [ "$YES_OR_NO" = "no" ]; then
  echo "Good afternoon!"
else
  echo "Sorry, $YES_OR_NO not recognized. Enter yes or no."
  exit 1
fi
exit 0
#该片段来自于http://outofmemory.cn

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