check_command() { if ! command -v ifconfig >/dev/null 2>&1; then echo -e "\033[31mifconfig命令不存在,正在下载安装!\033[0m" if os="ubuntu"; then apt install -y net-tools >/dev/null 2>&1 elif os="centos"; then yum install
In the above example, the pattern was not found in the given file, so the grep result was empty and No match found was displayed on the console. Using Command Substitution with $() Use command substitution with $() to check if the grep command result is empty. Use Command Substitution ...
它允许开发人员定义和解析命令行选项,以便在脚本中根据用户提供的选项执行不同的操作。 getopts的基本语法如下: 代码语言:txt 复制 while getopts ":<options>" opt; do case $opt in <option1>) # 处理选项1的逻辑 ;; <option2>) # 处理选项2的逻辑 ;; ... \?) # 处理无效选项的逻辑 ;; esac ...
check-scripts:# Fail if any of these files have warningsshellcheck myscripts/*.sh or in a Travis CI.travis.ymlfile: script:# Fail if any of these files have warnings-shellcheckmyscripts/*.sh Services and platforms that have ShellCheck pre-installed and ready to use: ...
When you execute a command or run a script, you receive an exit code. An exit code is a system response that reports success, an error, or another condit...
It can also be used to check if a command exists. For example, the above code is similar to the previous two but uses the type -p command to check if the grep command exists. Again, we used the > operator to redirect the command’s output to the null device, which discards the ...
首先,Shell 是一个程序,提供一个与用户对话的环境。这个环境只有一个命令提示符,让用户从键盘输入命令,所以又称为命令行环境(commandline,简写为 CLI)。Shell 接收到用户输入的命令,将命令送入操作系统执行,并将结果返回给用户。本书中,除非特别指明,Shell 指的就是命令行环境。
Test cases consist of standard shell commands. Bats makes use of Bash'serrexit(set -e) option when running test cases. If every command in the test case exits with a0status code (success), the test passes. In this way, each line is an assertion of truth. ...
Check out a copy of the Bats repository. Then, either add the Bats bin directory to your $PATH, or run the provided install.sh command with the location to the prefix in which you want to install Bats. For example, to install Bats into /usr/local,$ git clone https://github.com/s...
mysqldump: command not found问题解决 首先得知道mysql命令或mysqldump命令的完整路径,可以使用find命令查找 除非你知道mysql安装路径可以略过这一步。 find/-name mysql-print 1. 例如我的mysql的路径是:/usr/local/mysql/bin/mysql,然后映射一个链接到/usr/bin目录下,相当于建立一个链接文件 ...