shell脚本练习05
发布时间:2020-12-15 23:27:21 所属栏目:安全 来源:网络整理
导读:########################################################################## File Name: 9 - 6 . sh # Author: zhang yunabo# mail: [email?protected] 163 .com# Created Time: Tue 18 Sep 2018 05 : 48 : 32 PM EDT###################################
######################################################################### # File Name: 9-6.sh # Author: zhang yunabo # mail: [email?protected]163.com # Created Time: Tue 18 Sep 2018 05:48:32 PM EDT ######################################################################### #!/bin/bash username0= echo "username has declared,but is et to null" echo "username0 = ${username0-`whoami`}" echo echo username1 has not been declared echo "username1 = ${username1- `whoami`}" username2= echo "username2 has declared,but is set to null" echo "${username2:-`whoami`}" variable= echo "${variable-0}" echo "${variable:-0}" unset variable echo "${variable-2}" echo "${variable:-3}" exit 0 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |