shell脚本

#!/bin/bash
#方法1,$RANDOM产生5位随机数,md5sum加密,然后截取8位
echo $RANDOM | md5sum | cut -c 1-8
#方法2
openssl rand -base64 4
#方法3
cat /proc/sys/kernel/random/uuid | cut -c 1-8

0240b838
MayR3g==
9467a4cf

#!/bin/bash
#方法1,cksum:打印CRC效验和统计字节
echo $RANDOM | cksum | cut -c 1-8
#方法2:
openssl rand -base64 4 | cksum|cut -c 1-8
#方法3
date +%N | cut -c 1-8

88342984
20663999
49795828

#!/bin/bash
function echo_color(){
    if [ $1 == "green" ]; then
        echo -e "33[32;40m$233[0m"
    elif [ $1 == red ]; then
        echo -e "33[31;40m$233[0m"
    fi
}
echo_color red "test"

#!/bin/bash
function echo_color(){
   case $1 in
       "green")
       echo -e "33[32;40m$233[0m";;
       "red")
              echo -e "33[31;40m$233[0m";;
       *)
           echo "Example:echo_color red string"
   esac
}
echo_color red "test"