[root@server0 ~]# ll total 24 -rw-------. 1 root root 8619 May 7 2014 anaconda-ks.cfg -rwxr-xr-x. 1 root root 336 Dec 24 00:11 batchusers drwxr-xr-x. 2 root root 6 Dec 16 21:06 Desktop drwxr-xr-x. 2 root root 6 Dec 16 21:06 Documents drwxr-xr-x. 2 root root 6 Dec 16 21:06 Downloads -rw-r--r--. 1 root root 3785 Feb 17 2017 mariadb.dump drwxr-xr-x. 2 root root 6 Dec 16 21:06 Music drwxr-xr-x. 2 root root 6 Dec 16 21:06 Pictures drwxr-xr-x. 2 root root 6 Dec 16 21:06 Public drwxr-xr-x. 2 root root 6 Dec 16 21:06 Templates -rw-r--r--. 1 root root 21 Dec 24 00:00 user1.txt drwxr-xr-x. 2 root root 6 Dec 16 21:06 Videos [root@server0 ~]# ./batchusers Usage: /root/batchusers userfile [root@server0 ~]# ./batchusers /etc/ Input file not found [root@server0 ~]# ./batchusers user1.txt user yange1 is created user yange2 is created user yange3 is created [root@server0 ~]# cat batchusers #!/usr/bin/bash if [ $# -eq 0 ];then echo "Usage: /root/batchusers userfile" exit 1 fi if [ ! -f "$1" ];then echo "Input file not found" exit 2 fi for user in `cat $1` do id $user &>/dev/null if [ $? -eq 0 ];then echo "user $user already exists" else useradd $user -s /bin/false echo "user $user is created" fi done [root@server0 ~]#