Linux基础之shell函数(长期更新函数)

function

函数名 ()
{函数体&＃xff1b;}**跨脚本调用函数**
source 写了函数的脚本
然后就可以在当前环境调用了
local 变量名 意义同局部变量
return 结束函数返回结果
$?可查看函数返回状态
function(){echo $[$1&＃43;$2]
}
function 10 20 #传参


调用函数直接&＃xff0c;写函数名
小技巧 系统路径/etc/init.d/funcation 文件里带有大量系统函数
action 函数可实现以下功能

递归调用

不停调用自己 linux中会不停开启子shell 递归函数一定要有结束条件
#轻松破坏linux
func () {let i&＃43;&＃43;echo $ifunc
}


函数库(写一些功能)

#!/bin/bash
#
#********************************************************************
#Author: YiMingLANG
#QQ: 1428040096
#Date: 2021-10-4
#FileName&＃xff1a; founcations
#Copyright (C): 2021 All rights reserved
#********************************************************************
COLOR&＃61;"echo -e \E[1;32m"
END&＃61;"\E[0m"
NUMBER&＃61;"10" disable_firewalld(){${COLOR}********** stop the firewalld and close the firewalld *********${END}FIREWALLD_STATUS&＃61;&＃96;systemctl status firewalld&＃96;if echo ${FIREWALLD_STATUS} |grep -o "active (running)"; thensystemctl stop firewalld && systemctl disable firewalld &>/dev/null${COLOR}********** firewalld status *********${END}FIREWALLD_STATUS&＃61;"firewalld is dead"echo ${FIREWALLD_STATUS}else${COLOR}********** firewalld status *********${END}FIREWALLD_STATUS&＃61;"firewalld is dead"echo ${FIREWALLD_STATUS}fi${COLOR}********** firewalld over *********${END}
}disable_selinux(){sed -ir &＃39;s/^SELINUX&＃61;.*/SELINUX&＃61;disabled/&＃39; /etc/selinux/configsetenforce 0echo "目前selinux的状态为&＃96;getenforce&＃96;"
}network_interface(){sed -r -i.bak &＃39;/^GRUB_CMDLINE_LINUX&＃61;/s&＃64;"$&＃64; ifnames&＃61;0"&＃64;&＃39; /etc/default/grub#此处替换配置文件(错误删除&＃xff0c;需要补充)SYSINFO&＃61;&＃96;cat /proc/version&＃96;if echo ${SYSINFO} | grep -oE &＃39;centos&＃39; &> /dev/null ;then#centosgrub2-mkconfig -o /boot/grub2/grub.cfgecho "centos 重启后生效"elif echo ${SYSINFO} | grep -oE &＃39;ubuntu&＃39; &> /dev/null;then#ubuntugrub-mkconfig -o /boot/grub/grub.cfgecho "ubuntu 重启后生效"
}infor_system(){RED&＃61;"\E[1;31m"GREEN&＃61;"echo -e \E[1;32m"END&＃61;"\E[0m"$GREEN----------------------Host systeminfo--------------------$ENDecho -e "HOSTNAME: $RED&＃96;hostname&＃96;$END"#echo -e "IPADDR: $RED&＃96; ifconfig eth0|grep -Eo &＃39;([0-9]{1,3}\.){3}[0-9]{1,3}&＃39; |head -n1&＃96;$END"echo -e "IPADDR: $RED&＃96; hostname -I&＃96;$END"echo -e "OSVERSION: $RED&＃96;cat /etc/redhat-release&＃96;$END"echo -e "KERNEL: $RED&＃96;uname -r&＃96;$END"echo -e "CPU: $RED&＃96;lscpu|grep &＃39;Model name&＃39;|tr -s &＃39; &＃39;|cut -d : -f2&＃96;$END"echo -e "MEMORY: $RED&＃96;free -h|grep Mem|tr -s &＃39; &＃39; : |cut -d : -f2&＃96;$END"echo -e "DISK: $RED&＃96;lsblk |grep &＃39;^sd&＃39; |tr -s &＃39; &＃39; |cut -d " " -f4&＃96;$END"$GREEN---------------------------------------------------------$END
}

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