常用脚本

判断hpacucli rpm包是否安装,如果没有安装执行命令安装

#!/bin/bash
if [ ! -f /usr/sbin/hpacucli ]
 then
    echo 'hpacucli-7.85-18.linux.rpm is not install'
    echo 'please install hpacucli-7.85-18.linux.rpm'

    rpm -ivh hpacucli-7.85-18.linux.rpm > /dev/null 2>&1

    sleep 10

    echo 'hpacucli-7.85-18.linux.rpm install done'
fi

 

判断用户级别脚本

if [ ! `whoami` = root ]
then
        echo -e "\e[31;1m ERROR:It is able to executed only by user ROOT.\e[0m"
        exit 1
fi

 

 

do_continue.sh

#!/bin/bash

continue=n
echo -e "Do you want to continue?(y/n)"
read continue
if [ $continue != y ]
  then
     echo "conitune quit"
     exit 0
fi
echo "OK... we will continue"    

 

print_args.sh  打印出脚本参数

#!/bin/bash
#
# The shift command removes the argument nearest
# the command name and replaces it with the next one
#

while [ $# -ne 0  ]    $# : 脚本执行的参数个数
do
        echo $1
         shift
done

 

 

判断输入的用户名是否存在

#!/bin/bash

echo -e "\e[40;32;1m please input user name: \e[0m"
read name
grep "$name" /etc/passwd  >/dev/null 2>&1
if [ $? -eq 0 ]
 then
   echo "user $name exist"
   exit 0
else
   echo "user $name no exist"
   exit 1
fi

 

一个简单的条件例程

测试条件之逻辑运算 
-a      And 
-o      Or

 

#!/bin/bash
echo -e "Are you ok ?"
read answer
if [ "$answer" = "Y" -o "$answer" = "y" ]    必须使用参数-o ,使用or出错
   then
     echo "I am ok"
elif [ "$answer" = "N" -o "$answer" = "n" ]
   then
     echo "I am no ok"
else
     echo "what is your mean"
fi

显示所有命令行参数

$@和$*:依次显示你运行这个脚本时的所有参数

#!/bin/bash
    for i in "$@"   或者  for i in "$*" 
    do
    echo $i
    done
    exit 0

 

i=1

i=$[$1+1]   $[] 表示进行算术运算

ehco $i