linux学习基本练习--echo/printf用法

Posted 2020-08-13

1、echo是内部命令还是外部命令？其作用是什么？如何显示“the year is 2016.Today is 10yue 26”为两行？

通过type命令可知echo是内部命令：

[[email protected] ~]# type echo

echo is a shell builtin

echo作用：直接显示输入的内容。

echo -e "the year is 2016. \n today is 7."

[[email protected] ~]# echo -e "The year is 2016. \nToday is 7."

The year is 2016. 

Today is 7.

2、printf是内部命令还是外部命令？其作用是什么？如何显示“the year is 2016.Today is 10yue 26”为两行？

通过type命令可知printf是内部命令：

[[email protected] ~]# type printf

printf is a shell builtin

printf作用：格式并显示输入的内容。

printf "the year is 2016. \n today is 7."

[[email protected] ~]# printf "The year is 2016.Today is 7.\n"

The year is 2016.Today is 7.

[[email protected] ~]# 

3、file命令使用及用法

man file  determine file type  确定文件类型

eg: file /bin/ls

file 绝对路径

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