shell编程学习笔记

#!/bin/bash
##########################################
# File Name: 21_check_service.sh
# Version: V1.1
# Author: zhangpeng
# Organization: linuxjk.cn
# Desc: 服务状态检查脚本
##########################################

# 1. 获取服务名称read -r禁用转义符
read -rp "Please input a service name: " service

# 2. 检查输入是否为空
if [ -z "$service" ]; then
    echo "Usage: sh $0 <service_name>"
    exit 1
fi

# 3. 检查服务是否存在--type确保只检查服务文件
# 直接通过 systemctl 查询（无需管道）
#if ! systemctl list-unit-files --type=service "$service.service" &>/dev/null
if ! systemctl list-unit-files --type=service | grep -qw "^$service.service"; then
    echo "Error: Service '$service' does not exist."
    exit 2
fi

# 4. 获取状态信息
run=$(systemctl is-active "$service")
auto=$(systemctl is-enabled "$service")

# 5. 判断逻辑优化
# 修正后的代码片段
#systemctl is-active "$service" &>/dev/null
#if [ $? -eq 0 ];then
#echo "$service is running"
#else
#echo "$service is running"
#fi
#和下面的格式不同效果一样：命令返回值为0则正确输出，不为0进入else，
#把命令放在if后的弊端：类似于expr那种成功的返回值为0或1 的命令不行
if systemctl is-active "$service" &>/dev/null
then
	echo "$service is running"
else
	echo "$service is not runing"
fi

if systemctl is-enabled "$service" &>/dev/null
then
	echo "$service is enabled"
else
	echo "$service is disenabled"
fi













#if [ "$run" = "active" ]; then
#    status1="running"
#else
#    status1="not running"
#fi

#if [ "$auto" = "enabled" ]; then
#    status2="enabled"
#else
#    status2="disabled"
#fi

#if [ "$run" = "active" ] && [ "$auto" = "enabled" ]; then
#    echo "$service is $status1, and $status2"
#elif [ "$run" = "active" ] && [ "$auto" != "enabled" ]; then
#    echo "$service is $status1"
#elif [ "$auto" = "disabled" ] && [ "$run" = "active" ]; then
#    echo "$service is $status2"
#else
#    echo "$service is not running and disabled"
#    exit 3
#fi
#exit 0

#!/bin/bash
##########################################
# File Name:34_check_url.sh
# Version:V1.0
# Author:zhangpeng
# 0rganization:linuxjk.cn
# Desc:案例34：检查指定web/api是否可以访问
#color func
source /funcs/func_diy.sh
###########################################
#1.vars
url=$1

#2.检查参数个数是否为1（空也退出）
check_var(){
if [ $# -ne 1 ]
then
	redecho "help: sh $0 xxx.com "
	exit 1
fi
}
#检查系统中是否有curl命令
yum_curl(){
if  ! which curl &>/dev/null ;then
	yum install -y curl &>/dev/null
fi
}

#检查到目标网站之间线路是否通畅
check_net(){
if ! ping -c1 $url &>/dev/null ;then
	echo "net connection failed! or $url is not exist! "
	exit 2
fi
}
#check [[ =~ ]] .com  可以加一步用正则匹配输入的是否为网站（xxx.com等格式）
#使用curl命令检查是否可以访问
check_url(){
if curl -s $url &>/dev/null ;then
	greenecho "$url  can see! "
else
	redecho "$url see failed! "
fi
}
main(){
check_var "$@"
yum_curl
check_net
check_url
}
main "$@"

#!/bin/bash
##########################################
# File Name:36_random_file.sh
# Version:V1.0
# Author:zhangpeng
# 0rganization:linuxjk.cn
# Desc:案例36：使用for循环在/oldboy目录下通过随的10个小写字母加固定字符oldboy批量创建十个html文件
###########################################
#1.vars
fixed=linux
dir=/oldboy/
#检查目录是否为空，为空则创建
if [ ! -d ${dir} ];then
	mkdir -p $dir
fi
#2.run for
for i in {1..10}
do
#利用两种方法取出10个随机小写字母
file=$(mkpasswd-expect -l 10 -d 0 -s 0 -C 0 )
  #file=$(tr -cd 'a-zA-Z0-9' </dev/urandom | head -c10)
  touch ${dir}${file}_${fixed}.html
done