Shell脚本-echo命令 转义符

echo 是一个 Shell 内建命令，用来在终端输出字符串，并在最后默认加上换行符。

输出不换行

echo 命令输出结束后默认会换行，如果不希望换行，可以加上-n参数，如下所示：

#!/bin/bash
name="Tom"
age=20
height=175
weight=62
echo -n "${name} is ${age} years old, "
echo -n "${height}cm in height "
echo "and ${weight}kg in weight."
echo "Thank you!"

输出：

Tom is 20 years old, 175cm in height and 62kg in weight.
Thank you!

输出转义字符

默认情况下，echo 不会解析以反斜杠\开头的转义字符。比如，\n表示换行，echo 默认会将它作为普通字符对待。请看下面的例子：

[[email protected] ~]# echo "hello \nworld"
hello \nworld

参数：-e

我们可以添加-e参数来让 echo 命令解析转义字符

[[email protected] ~]# echo -e "hello \nworld"
hello
world

转义字符：\c

有了-e参数，我们也可以使用转义字符\c来强制 echo 命令不换行了

#!/bin/bash
name="Tom"
age=20
height=175
weight=62
echo -e "${name} is ${age} years old, \c"
echo -e "${height}cm in height \c"
echo "and ${weight}kg in weight."
echo "Thank you!"

输出：

Tom is 20 years old, 175cm in height and 62kg in weight.
Thank you!