If you run a command with the same arguments nearly all the time, create a “shortcut” alias for this — I have many of them. I often use the x syntax — ie, the command’s normal name followed by an x. For example, with netstat, I always run it with -n(numeric addresses only...
在 Bash 中充分利用这一点可以增加程序的灵活性。例如：create_user && make_home_directory这条语句，只有 create_user 返回 0 时，才会执行 make_home_directory。而create_user; make_home_directory则表示无论 create_user 的返回值是什么，都会执行 make_home_directory。类似的，你也可以通过：create_user |...
#!/bin/bashfunctiontask1() {echo"Running task1..."sleep5}functiontask2() {echo"Running task2..."sleep5}task1 &task2 &waitecho"All done!"这里我们运行两个并行函数作为后台作业：task1 和 task2。此外，我们使用 wait 内置函数使脚本实例保持活动状态，直到后台作业完成执行。如果您检查脚本的执行时...
Knowing how conditionals work in bash open up a world of scripting possibilities. We’ll learn the basic syntax, including if, else, and elif. Then we'll look at a few of the "primary" operators you can leverage in a conditional statement such as = for string equality, -eq for numeric...
build_dependencies=(isomd5sum createrepo createrepo_c genisoimage rpm-build rpmdevtools) 如果数组元素本身包含空格,应当使用双引号: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 bash my_array=("element 1""element 2""element 3") 数组在声明时可以不连续索引,特别是在关联数组(字典)中使用键值对形...
Bash lets you create a function on the fly, really handy if you plan on using a code block more then once. Functions reduce the amounts of editing you have to do in a script, if and when you have to update your script. Let's get to it! Example Here is an example script: ech...
在命令行输入字符a,然后按两次tab键,系统列出以字母a开头的所有命令。 [root@CentOS8 ~]# a accessdb adduser alternatives apropos arping augenrules aureport authselect avcstat addgnupghome agetty anacron arch auditctl aulast ausearch autrace awk addpart alias applygnupgdefaults arpd auditd aulastlog au...
my_function () { echo "This is a function"; } my_function # calls the function 代码中定义了一个 my_function 函数,调用时也只需要写函数名。 7. 用双引号引用变量 前面第 2 条提到要用 ${} 限定变量名的范围,这里要说的是利用引号限定变量值的范围。
参考: https://www.digitalocean.com/community/tutorials/an-introduction-to-useful-bash-aliases-and-functions https://www.educba.com/bash-alias/ https://linuxize.com/post/how-to-create-bash-aliases/
function do_something() { # ... } 内部变量 获取bash二进制文件的位置 "$BASH" 获取当前正在运行的bash进程的版本 # As a string. "$BASH_VERSION" # As an array. "${BASH_VERSINFO[@]}" 打开用户首选的文本编辑器 "$EDITOR" "$file" ...