Shell 的打印

echo

可以使用echo对字符串进行打印，根据需求善用双引号和单引号。
注意：echo 输出是自带换行的

 #!/bin/bash

name='LiLei'
echo "Your name is LiLei"
echo "Your name is $name"
echo "\"Your name is $name\""
echo 'Your name is LiLei'
echo 'Your name is $name'

#sh test.sh
Your name is LiLei
Your name is LiLei
"Your name is LiLei"
Your name is LiLei
Your name is $name

• 开启转义 -e， \n表示换行，\c表示不换行。

 #!/bin/bash

echo "Your name is LiLei\n"
echo -e "Your name is LiLei\n"
echo "Your name is LiLei\c"
echo -e "Your name is LiLei\c"

#sh test.sh
Your name is LiLei\n
Your name is LiLei

Your name is LiLei\c
Your name is LiLei$ 

• 结果重定向， 符号>

 #!/bin/bash

echo "Your name is LiLei\n" >name.txt

# result
$ cat name.txt
Your name is LiLei\n

• 打印执行命令结果， 注意特殊符号 `

 #!/bin/bash

echo `date`

#sh test.sh
Mon Jul 15 10:42:41 CST 2019

printf

可以使用printf对字符串进行格式化打印。
注意：printf打印不会自动换行， 换行必须显式添加换行符(\n)