Shell echo令：输出字符串

echo 是一个 Shell 内建令，用来在终端输出字符串，并在默认加上换行符。请看下面的例子：

#!/bin/bash
name="Shell教程"
url="http://c.biancheng网站站点" rel="nofollow"  /> 读者，你好！
http://c.biancheng网站站点" rel="nofollow"  />  
#!/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!"

运行结果：

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：

[root@localhost ~]# echo "hello \nworld"

hello \nworld

我们可以添加-e参数来让 echo 令解析转义字符。例如：

[root@localhost ~]# echo -e "hello \nworld"
hello

world

\c 转义字符

有了-e参数，我们也可以使用转义字符\c来强制 echo 令不换行了。请看下面的例子：

#!/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!"

运行结果：

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

Thank you!