SHELL编程-Shell编程进阶
1.1 shell脚本介绍shell结构以及执行
cd shell/
vim first.sh
#!/bin/bash
##The first test shell script
##written by aming.
ls /tmp/
echo "This is the first script."
bash first.sh
./first.sh
sh first.sh
sh -x first.sh
date命令
date日期
cal
yum -y install ntp
ntpdate time.windows.com
netpdate ntp.fudan.com
date +%TY ymd H M S s
date -d "-2 days" +%F
shell自定义变量
vim 2.sh
#!/bin/bash
##
##
read -t 3 -p "please input a number: " number
echo $number
sh 3.sh
vim 3.sh
#! /bing/bash
##
##
echo "\$1=$1"
echo "\$2=$2"
echo"\$0=$0"
echo "\$3=$o"
sh 3.sh
if逻辑判断
vim if.sh
#!/bin/bash
a=5
if [ $a -gt 10 ]
then
echo "a>10"
elif [$a -lt 4 ]
then
echo "a
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