$0 is the name of the current script as it was executed. So if we run the script as ./examples/shell/absolute.sh then that will be the content of $0. realpath prints the abosulte path. dirname prints the directory name, leaving the last part of the path which is in this case ...
[dmtsai@study~]$ type[-tpa]name 选项与参数::不加任何选项与参数时,type 会显示出 name 是外部指令还是 bash 内建指令-t:当加入-t 参数时,type 会将 name 以底下这些字眼显示出他的意义:file:表示为外部指令;alias:表示该指令为命令别名所设定的名称;builtin:表示该指令为 bash 内建的指令功能;-p:如...
alias apt-get='sudo apt-get' ... alias命令默认会列出当前用户定义好的别名。 如何定义或者创建一个 bash shell 别名 使用下面语法创建别名: alias name =value alias name = 'command' alias name = 'command arg1 arg2' alias name = '/path/to/script' alias name = '/path/to/script.pl arg1' ...
使用变量分配和访问变量 $hello_world="value"# Create the variable name.$var="world"$ref="hello_$var"# Print the value of the variable name stored in 'hello_$var'.$printf'%s\n'"${!ref}"value 或者,在bash4.3+上: $hello_world="value"$var="world"# Declare a nameref.$declare -n re...
$file-i /etc/init.d/network/etc/init.d/network: text/x-shellscript; charset=us-ascii $file-i /usr/bin/file/usr/bin/file: application/x-executable; charset=binary $file-i /etc/etc: inode/directory; charset=binary #使用-N选项,输出的队列可以在文件名之后无空白填充的形式显示,对比如下 ...
chmod +x script.sh 问题2:变量未正确设置 原因:在脚本中变量未正确声明或赋值。 解决方法: 代码语言:txt 复制 #!/bin/bash my_var="Hello, World!" echo $my_var 问题3:命令找不到 原因:系统中缺少所需的命令或程序。 解决方法: 代码语言:txt 复制 sudo apt-get install <package_name> # 对于 Debi...
sudo apt-getupdatesudo apt-getinstallcron 成功安装后,您可以继续使用 cron 库来安排脚本的执行。 crontab-e 这将打开/etc/crontab文件,并允许您编写如下命令来安排脚本的执行: @weekly /path/backup_script.sh 我不会进一步讨论您可以使用crontab做什么,因为它不在本文的范围内。
The name of the currently executing script is: ./BashScript.shWe can verify the value at the first index; we got ./BashScript.sh, the basename of the currently executing script. Using $0 VariableTo get the current script’s directory in a Bash, use the $0 array variable. In Bash, the...
As you can see, if the echo bash command is used with double quotation marks““, then the script will print out the actual value of a variable. Otherwise, if the single quotation marks‘‘are used, it will print out only the name of a variable. ...
Here's quick look into the special variables you get in bash shell: Now, let's have a look at them one by one in detail. $0: Get the name of the script To get the name of the current script, you will have to utilize the#0variable in your script with the echo. ...