判断linux的用户状态
目的：判断linux系统中某一用户的 是否存在，若存在，则输出该用户的家目录，使用的内核和密码状态。
具体的代码：
#!/bin/bash
read -p "please input one account:" ACCOUNT
if grep "^$ACCOUNT\>" /etc/passwd &>/dev/null;then
HOMEDIR=`grep "^$ACCOUNT\>" /etc/passwd |cut -d: -f 6`
SHELL=`grep "^$ACCOUNT\>" /etc/passwd |cut -d: -f 7`
echo "this user $ACCOUNT is exist"
echo "this user homdir is $HOMEDIR"
echo "this user shell is $SHELL"
/usr/bin/passwd -S $ACCOUNT &>/tmp/state
if grep -i "lock" /TMP/STATE;then
echo "lock"
elif grep -i "empty" /tmp/state;then
echo "empty"
elif grep -i "md5" /tmp/state;then
echo "encry"
fi
else
echo "this user $ACCOUNT is not exist"
fi