1、 写一个脚本/root/bin/createuser.sh，实现如下功能：使用一个用户名做为参数，如果指定参数的用户存在，就显示其存在，否则添加之；显示添加的用户的id号等信息
[root@localhost bin]# cat createuser.sh #!/bin/bash # Date: 2016.8.12 # Author: cyh # Description: Determine whether a user exists user=`cut -d: -f1 /etc/passwd |grep -o "$1"` [ $# -ne 1 ] && exit 1 if [[ -n $user ]]; then echo "User already exists!" echo "The user information: `grep "^$1\>" /etc/passwd |cut -d: -f 1,3`" else useradd $1 > /dev/null echo "The user has been created!" echo "The user information: `grep $1 /etc/passwd |cut -d: -f 1,3`" fi
脚本测试
[root@localhost bin]# getent passwd tom [root@localhost bin]# createuser.sh tom The user has been created! The user information: tom:2028 [root@localhost bin]# getent passwd tom tom:x:2028:2033::/home/tom:/bin/bash [root@localhost bin]# [root@localhost bin]# getent passwd zhangsan zhangsan:x:2022:2024::/home/zhangsan:/bin/bash [root@localhost bin]# createuser.sh zhangsan User already exists! The user information: zhangsan:2022
2、写一个脚本/root/bin/yesorno.sh，提示用户输入yes或no,并判断用户输入的是yes还是no,或是其它信息
[root@localhost bin]# cat yesorno.sh #!/bin/bash # Description: Determine the user input characters(yes or no). read -t5 -p "Please input yes or no: " ans [ -z $ans ] && echo "You have no input, script has quit" && exit 10 case $ans in [yY][eE][sS]|y|Y) echo "Input is yes!" ;; [nN][oO]|n|N) echo "Input is no!" ;; *) echo "Input error, please enter again." ;; esac
脚本测试
[root@localhost bin]# yesorno.sh Please input yes or no: y Input is yes! [root@localhost bin]# yesorno.sh Please input yes or no: yEs Input is yes! [root@localhost bin]# yesorno.sh Please input yes or no: nO Input is no! [root@localhost bin]# yesorno.sh Please input yes or no: n Input is no! [root@localhost bin]# yesorno.sh Please input yes or no: tt Input error, please enter again.
3、写一个脚本/root/bin/filetype.sh,判断用户输入文件路径，显示其文件类型（普通，目录，链接，其它文件类型）
[root@localhost bin]# cat filetype.sh #!/bin/bash # Author: cyh # Date: 2016.8.15 # Description: Input a file, and determine the type of the file if [ $# -ge 1 ]; then if [ -z $1 ]; then echo "Your input is empty" elif [ -d $1 ]; then echo "this is a directory." elif [ -h $1 ]; then echo "this is a link file." elif [ -f $1 ]; then echo "this is a common file." elif [ -c $1 ]; then echo "this is a character device file." elif [ -b $1 ]; then echo "this is a block device file." elif [ -s $1 ]; then echo "this is a socket file." elif [ -p $1 ]; then echo "this is a pipe file." else echo "The input character is empty or file does not exist,please specify again." fi else read -t 10 -p "Please input file name: " file [[ ! -e $file || -z $file ]] && echo "The input is empty or file does not exist,please specify again." && exit type=`ls -ld $file 2> /dev/null | cut -c1` case $type in d) echo "this is a directory." ;; -) echo "this is a common file." ;; l) echo "this is a link file." ;; s) echo "this is a socket file." ;; c) echo "this is a character device file." ;; b) echo "this is a block device file." ;; p) echo "this is a pipe file." ;; *) echo "this not is file." esac fi
脚本测试
[root@localhost bin]# filetype.sh dfdfd The input character is empty or file does not exist,please specify again. [root@localhost bin]# filetype.sh /var this is a directory. [root@localhost bin]# filetype.sh /var/log/ this is a directory. [root@localhost bin]# filetype.sh /var/log/messages this is a common file. [root@localhost bin]# filetype.sh /tmp/cat this is a link file. [root@localhost bin]# filetype.sh /tmp/hogsuspend this is a pipe file. [root@localhost bin]# filetype.sh /var/log/messages21 The input character is empty or file does not exist,please specify again. [root@localhost bin]# filetype.sh Please input file name: dfsdfsfq2 The input character is empty or file does not exist,please specify again. [root@localhost bin]# filetype.sh Please input file name: /etc/fstab this is a common file. [root@localhost bin]# filetype.sh Please input file name: /tmp/cat this is a link file. [root@localhost bin]# filetype.sh Please input file name: /tmp/hogsuspend this is a pipe file.
4、写一个脚本/root/bin/checkint.sh,判断用户输入的参数是否为正整数
[root@localhost bin]# cat checkint.sh #!/bin/bash # read -p "Please input an integer:" integer #[ $integer -lt 0 ] && echo "Please enter at least one value" && exit 10 if [[ $integer =~ ^0*[0-9][0-9]*$ ]]; then echo "this is an integer" else echo "this not an integer" fi
脚本测试
[root@localhost bin]# checkint.sh Please input an integer:12 this is an integer [root@localhost bin]# checkint.sh Please input an integer:3.14 this not an integer [root@localhost bin]# checkint.sh Please input an integer:df this not an integer [root@localhost bin]# checkint.sh Please input an integer:09 this is an integer [root@localhost bin]# checkint.sh Please input an integer:9f this not an integer
原创文章，作者：cyh5217，如若转载，请注明出处：http://www.178linux.com/35908
