linux用户是否存在

How to test whether a user account, say linuxuser, already exist on ?

如何测试是否已经存在用户帐户（例如linuxuser）？

You may make use of which tries to get user IDs.

您可以利用尝试获取用户ID。

The Bash code snippet is as follows.

Bash代码片段如下。

user=helloid -u $user >/dev/null 2>&1if [ "$?" == "0" ]; then  echo "user $user already exist."else  echo "user $user doesn't exist."fi

Or a shorter one

或更短的一个

userexist=true[ "`id -u $user 2>/dev/null`" == "" ] && userexist=false

The $userexist variable will contains whether $user already exists.

$userexist变量将包含$user是否已经存在。

翻译自:

linux用户是否存在