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linux中echo是什么意思

What does echo mean in linux

May 24, 2022 am 10:19 AM
linux

在linux中,echo是在显示器上显示的意思,是一个用于提示的命令,语法为“echo [选项] [输出内容]”;若输出的内容没有特殊含义,则直接输出原内容到显示器,若输出内容有特殊含义,则输出打印指定含义的内容。

What does echo mean in linux

本教程操作环境:linux7.3系统、Dell G3电脑。

linux中echo是什么意思

echo命令的意思是在显示器上显示一段文字,起到提示的作用。

该命令格式如下:

[root@localhost ~]# echo [选项] [输出内容]
Copy after login

选项:

-e:支持反斜线控制的字符转换

-n:取消输出后行末的换行符号

其实 echo 命令非常简单,命令的输出内容如果没有特殊含义,则原内容输出到屏幕;如果输出内容有特殊含义,则输出打印其含义。

示例如下:

[root@localhost ~]# echo "c.biancheng.net"
#echo的内容就会打印到屏幕上
c.biancheng.net
[root@localhost ~]#
Copy after login

echo命令就是这么简单,输出什么内容,这个内容就会打印到屏幕上。

在 echo 命令中如果使用了"-e"选项,则可以支持控制字符

控制字符如下:

What does echo mean in linux

示例如下:

[root@localhost ~]# echo -e "\\ \a"
\
#输出 \,同时会在系统音响中输出一声警告音
Copy after login

在这个例子中,echo 命令会输 \。如果不像"\\"这样写,那么因为 \ 有特殊含义,所以不会输出。

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