Bash脚本是一种在Linux和Unix系统中使用的脚本语言,用于自动化执行一系列命令和任务。它可以通过if条件和and运算符来实现条件判断和逻辑运算。 if条件是Bash脚本中用于进行条件判断的关键字。通过if条件,可以根据条件的真假来执行不同的代码块。if条件的语法如下: 代码语言:txt 复制 if condition then
1、不能使用程序中的保留字:例如if、for; 2、只能使用数字、字母及下划线,且不能以数字开头;bash的配置文件: 按生效范围划分,存在两类: 全局配置: /etc/profile /etc/profile.d/*.sh /etc/bashrc 个人配置: ~/.bash_profile ~/.bashrc 按功能划分,存在两类: profile类:为交互式登录的shell提供配置 bashrc...
bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then e...
才会使用到 [] 比如if grep "\<bash\>" /etc/passwd ; then echo "111" fi 此时if会自动获取右侧grep命令执行后的状态结果,是0则if会认为是满足条件的,会输出111 此时不会使用到[] 2 整数测试/比较: 数值比较一定加[] -eq: 测试两个整数是否相等;比如 $A -eq $B -ne: 测试两个整数是否不等;不...
elifis used for "else if" kind of condition The if else conditions always end withfi the use of semicolon;andthenkeyword Before I show the examples of if and else-if, let me share common comparison expressions (also called test conditions) first. ...
if[-s/tmp/hoge.txt];then# 1バイトでも中身があれば何もしないelse# 0バイトだったら消すrm/tmp/hoge.txtfi Bourneシェルやzshを使っている場合はこれで大丈夫。ところがBashで動かそうとするとエラーになってしまう。 Bashでは、thenやelif、else節の後に有効なコードを置かずに済ませる...
shell bash：在if语句中使用条件AND OR你不需要for循环，也不需要[[...]]条件结构，你只需要模式匹配...
With any of the installed tools you can automate the update by running it with the -u option or passing in update as the arguments Ex. stocks update or stocks -u This will clone the repository and install the new versions of scripts that were installed, if you didn’t install a certain...
find_lock.sh - tries to find if a lockfile is used in the given or current working directory by taking snapshots of the file list before and after a prompt in which you should open/close an application foreach_path_bin.sh - runs each binary of the given name found in $PATH with the...
Create one with touch ~/.zshrc and run the install script again. If you use bash, the previous default shell, your system may not have .bash_profile or .bashrc files where the command is set up. Create one of them with touch ~/.bash_profile or touch ~/.bashrc and run the install ...