read命令
read命令是一个内置命令，用于从终端或文件读取输入，read命令读取一个输入行，直至遇到换行符。行尾的换行符在读入时被转换成一个空字符。如果read命令后未跟变量名，读入的行将被赋给内置变量REPLY。
你也可以使用read命令来中断程序的运行，直至用户输入一个回车。
如果代－r选项，read命令将忽略反斜杠／新行符对，把反斜杠作为行的一部分。
表14-1 read命令
|
格 式 |
含 义 |
|
read answer |
从标准输入读取一行并赋值给变量answer |
|
read first last |
从标准输入读取一行，直至遇到第一个空白符或换行符。把用户键入的第一个词存到变量first中，把该行的剩余部分保存到变量last中 |
|
read |
标准输入读取一行并赋值给内置变量REPLY |
|
read –a arrayname |
读入一组词，依次赋值给数组arrayname③ |
(续表)
|
格 式 |
含 义 |
|
read -e |
在交互式shell命令行中启用编辑器。例如，如果编辑器是vi，则可以在输入行时使用vi命令③ |
|
read –p prompt |
打印提示符，等待输入，并将输入赋值给REPLY变量③ |
|
read –r line |
允许输入包含反斜杠③ |
#!/bin/bash
#scriptname: nosy
echo -e "are you happy? /c"
read answer
echo "#answer is the right response."
echo -e "what is your full name? /c"
read first middle last
echo "Hello $first"
echo -n "where do you work? "
read
echo Iguess $REPLY keeps you busy!
read -p "enter your job title: "
echo "I thought you might be an $REPLY."
echo -n "who are your best friends? "
read -a friends
echo "Say hi to ${friends[2]}."
The results:
are you happy? never too happy
never too happy is the right response.
what is your full name? tu you wu
Hello tu
where do you work? NUAA
I guess NUAA keeps you busy!
enter your job title: Com
I thought you might be an Com.
who are your best friends? sj cjs lj
Say hi to lj.
