#!/bin/bash name="Shell教程" url="http://task.lmcjl.com/shell/" echo "读者,你好!" #直接输出字符串 echo $url #输出变量 echo "${name}的网址是:${url}" #双引号包围的字符串中可以解析变量 echo '${name}的网址是:${url}' #单引号包围的字符串中不能解析变量运行结果:
读者,你好!
http://task.lmcjl.com/shell/
Shell教程的网址是:http://task.lmcjl.com/shell/
${name}的网址是:${url}
-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 ${weight}kg in weight." echo "Thank you!"运行结果:
Tom is 20 years old, 175cm in height and 62kg in weight.
Thank you!
\
开头的转义字符。比如,\n
表示换行,echo 默认会将它作为普通字符对待。请看下面的例子:
[root@localhost ~]# echo "hello \nworld"
hello \nworld
-e
参数来让 echo 命令解析转义字符。例如:
[root@localhost ~]# echo -e "hello \nworld"
hello
world
-e
参数,我们也可以使用转义字符\c
来强制 echo 命令不换行了。请看下面的例子:
#!/bin/bash name="Tom" age=20 height=175 weight=62 echo -e "${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!
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