echo "The name of this script is \"$0\"." echo "The name of this script is \"`basename $0`\"." echo if [ -n "$1" ] # 测试变量被引用. then echo "Parameter #1 is $1" # 需要引用才能够转义"#" fi if [ -n "$2" ] then echo "Parameter #2 is $2" fi if [ -n "${...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
echo "The name of this script is \"$0\"." echo "The name of this script is \"`basename $0`\"." echo if [ -n "$1" ] #测试变量被引用. then echo "Parameter #1 is $1" # 需要引用才能够转义"#" fi if [ -n "$2" ] then echo "Parameter #2 is $2" fi if [ -n "${10...
The if in a Bash script is a shell keyword that is used to test conditions based on the exit status of a test command. An exit status of zero, and only zero, is a success, i.e. a condition that is true. Any other exit status is a failure, i.e. a condition that is false. ...
When bash is invoked as an interactive login shell, or as a non-interactive shell with the –login option, it first reads and executes commands from the file /etc/profile, if that file exists. After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile, in...
Python，perl，C++ bash:脚本解释器 编程能力： 脚本编程 变量：内存空间，命名的内存空间（可以...
bash -c"echo 123"bash script.sh 上面这两种情况下,bash 运行完脚本,就退出了,不会出现 PROMPT,也不会等待用户输入新指令。 境变量$-里如果有字符i的话,代表是一个 interactive shell,否则是 non-interactive mode,我们可以简单测试一下: $>[[$-==*i*]]&&echo"Interactive"||echo"Not interactive"Interac...
echo "The name of this script is \"`basename $0`\"." echo if [ -n "$1" ] # 测试变量被引用. then echo "Parameter #1 is $1" # 需要引用才能够转义"#" fi if [ -n "$2" ] then echo "Parameter #2 is $2" fi if [ -n "${10}" ] # 大于$9的参数必须用{}括起来. ...
ifTEST;thenCMDfi TEST:条件判断,多数情况下可使用test命令来实现,返回值为0的话则执行CMD,否则就离开该条件结构体,脚本继续往下执行。 [root@c7-server ~]#cattest.sh#!/bin/bashifidzwl &> /dev/null;thenecho"User zwl exists."fi[root@c7-server ~]# bash test.shUser zwl exists. ...
# this is the first bash script echo"hello andy" 1. 2. 3. 4. (3)退出文件编辑,运行脚本:./或者source ,即可显示hello andy,这是一个最简单的demo啦。 note: (1)如果提示执行脚本没有权限-bash: ./: Permission denied则通过chmod...