Question

shell初学者写着玩，功能都可以实现,但总会报错：./IFS.sh: line 4: 0: command not found 求大神指点

#!/bin/bash

falg=1
while $flag;
do
{
echo please input your username:
read name
echo
line=$(grep ^$name /etc/passwd)
if [ $line ];
then
{
oldIFS=$IFS;
IFS=":"
count=0;
for item in $line;
do
[ $count -eq 0 ] && user=$item;
[ $count -eq 6 ] && shell=$item;
let count++
done;
IFS=$oldIFS
echo $user\'s shell is $shell;
flag=0;
}
else echo No such user,please check it and try again!;
fi
}
done

Answer 1

帮你检查一下。
1，首先第三行的flag 写成了falg.
2，while 后面是判断，用括号包起来。
3，运行过程中，如果中间有空格会出错。比如ftp,

4,如果使用roo这样的也通过 。
改了下脚本。目前是修复上面的错误。

#!/bin/bash

flag=1
while [ ${flag} ]
do
echo please input your username:
read name
username=`awk -F: '{print $1}' /etc/passwd`
for i in $username
do
if [ X"$i" == X"$name" ];then
hell=`awk -F: '{if($0~/^'"$i"'/) print $7}' /etc/passwd`
echo $i\'s shell is $hell;
exit 0
else
nouser=1
fi
done
[ $nouser=1 ] && echo No such user,please check it and try again!;
done