Linux上read命令的使用
阿新 • • 發佈：2019-02-28
文件描述符 repl num rgs 傾聽 word 目錄 linux linu 一:read傾聽是一種美德
1.傾聽鍵盤的輸入並保存到變量中
例如:#! /bin/bash
echo "please input your name"
read name
echo "welcome $name !"
exit 0
或是read自帶的顯示提示語
例如:
#! /bin/bash
read -p "please input two args" name place
echo "welcome $name to $place"
exit 0
2.如果不輸入變量,其值保存在REPLY變量中
例如:
#! /bin/bash
read -p "please input two args"
echo "the content of you just input is $REPLY"
exit 0
3.read加時間限制
#! /bin/bash
# 5秒內不輸入則
if read -t 5 -p "please input two args"
then
echo "the content of you just input is $REPLY"
else
echo "sorry you are too late"
exit 0
4.隱蔽輸入內容
#! /bin/bash
read -s -p "please input your password" password
echo "here,your password is $password"
5.使用 -u選項讀取文件
#! /bin/bash
exec 3<~/文檔/test.txt # ~/文檔/test.txt代表的是讀取的文件目錄
count=0
while read -u 3 -r var #這裏使用-r預防讀入每行時未正常換行
do
let count=$count+1 #let是執行計算的命令
echo "LIne $count:$var"
done
echo "finished!"
echo "Line num is $count"
exec 3<&- #關閉文件描述符
Linux上read命令的使用