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 |...
在Bash中,数组的定义无需特定类型声明,可以直接通过赋值来创建。数组元素通过空格分隔,且支持使用引号来定义包含空格的元素。例如: 代码语言:javascript 代码运行次数:0 运行 bash # 创建包含多个元素的数组 build_dependencies=(isomd5sum createrepo createrepo_c genisoimage rpm-build rpmdevtools) 如果数组元素本身包...
alias ll='ls -ahl'alias mvnc='mvn clean archetype:create-from-project'alias mvncc='mvn clean'alias mvnd='mvn clean deploy -Dmaven.test.skip'alias mvnda='mvn dependency:analyze'alias mvndl='mvn dependency:list'alias mvndt='mvn dependency:tree'alias mvni='mvn clean install -Dmaven.test...
"primary" operators you can leverage in a conditional statement such as = for string equality, -eq for numeric equality, and -e to check if a file exists. After that, we'll use conditional statements to create a function that asserts that the HTTP status of a given URL is between 200 ...
createUsersBulk.sh #!/bin/bash#批量创建用户read-p"Enter The Users Password : "PASSWDforUNAMEin`catusers.txt`doid$UNAME&> /dev/nullif[ $? -eq 0 ] ;thenecho"Already exists"elseuseradd$UNAME&> /dev/nullecho"$PASSWD"| passwd --stdin$UNAME&> /dev/nullif[ $? -eq 0 ] ;thenecho"$...
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...
Open up you favorite text editor and a create file called hello_world.sh. Insert the following lines to a file: NOTE:Every bash shell script in this tutorial starts withshebang:"#!"which is not read as a comment. First line is also a place where you put your interpreter which is in...
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" ...
mkdir: cannot create directory ‘learning’: File exists 1 最佳实践 建议通过将set -x命令添加到shell脚本来启用调试模式,如下所示: [root@localhost ~]# cat test3.sh #!/bin/bash set -x echo "Hello World!" mkdiir testing 然后运行脚本查看: ...