qq_41904061的博客

[root@izwz97473w2ydu1pgsmzk4z opt]# ls *explain.txtcache:0 4 8 9 acode:cppfile shellmytemp:ggg.sh my2.sh my3.sh myfirst.shrecover:default.conf[root@izwz97473w2ydu1pgsmzk4z opt...

https://blog.51cto.com/1208073155/1532560

top命令：https://www.cnblogs.com/zhoug2020/p/6336453.html负载：https://blog.youkuaiyun.com/ztf312/article/details/80342234小数比较大小：https://www.runoob.com/linux/linux-comm-bc.html特别注意：今天踩到的一个坑，是输入awk '{FS=":...

给大家看我第一次写的脚本，报了如下错误#!/bin/bashdeclare -i sdeclare -i is=0i=0while [ $i -le "100" ] do $s=$(( $s + $i )) $i=$(( $i + 1 )) doneecho "The sum is...

注意：没有ifconfig命令时https://www.cnblogs.com/jtnote/p/6103754.html

[root@izwz97473w2ydu1pgsmzk4z nginx]# df --helpUsage: df [OPTION]… [FILE]…Show information about the file system on which each FILE resides,//输出每个文件所在文件系统的信息or all file systems by default.//或默认情况下所...

使用locale -a | more 查看linux支持的所有语系[root@izwz97473w2ydu1pgsmzk4z ~]# locale -a | moreaa_DJaa_DJ.iso88591aa_DJ.utf8aa_ERaa_ER@saahoaa_ER.utf8aa_ER.utf8@saahoaa_ETaa_ET.utf8af_ZAaf_ZA.iso885...

[root@localhost bin]# wc --helpUsage: wc [OPTION]… [FILE]…用法：wc 选项 文件or: wc [OPTION]… --files0-from=FPrint newline, word, and byte counts for each FILE, and a total line ifmore than one FILE is s...

[root@izwz97473w2ydu1pgsmzk4z shell]# a=3[root@izwz97473w2ydu1pgsmzk4z shell]# b=4[root@izwz97473w2ydu1pgsmzk4z shell]# declare -i c=$a+$b[root@izwz97473w2ydu1pgsmzk4z shell]# echo $c7[root@izw...

[yangfenghe@localhost bin]$ su -?su: invalid option – ‘?’Usage:su [options] [-] [USER [arg]…]用法：su [选项] - [ 用户 [参数]]Change the effective user id and group id to that of USER.A mere - implies -l...

这里就会出现一个问题，ping命令会一直ping下去，除非我们指定次数：ping命令的使用：https://www.cnblogs.com/ftl1012/p/ping.html如果安装仓库到哪儿安装？阿里云镜像网址：https://opsx.alibaba.com/mirror###############################################...

https://cloud.tencent.com/developer/article/1171831

lsblk与df区别:https://blog.youkuaiyun.com/dishuji3122/article/details/78465314lsblk命令使用：https://blog.youkuaiyun.com/qianggezhishen/article/details/55517714

trap命令用法：https://blog.youkuaiyun.com/carolzhang8406/article/details/46504415/https://www.doc88.com/p-582676609909.html这部分打印内容比较重要修改之后：这里踩了两个坑：1、数组比较大小，里面既有数字，又有字符串。2、带有颜色的echo打印，漏写m，打印...

nmap：https://blog.youkuaiyun.com/tk86935367/article/details/8352015#/bin/bash#变量声明nmap=`which nmap`ssh_keygen=`which ssh-keygen`ssh_copy_id=`which ssh-copy-id`ifconfig=`which ifconfig`ssh=`whi...

[root@localhost shelltest]# userdel -?userdel: invalid option – ‘?’Usage: userdel [options] LOGINOptions:-f, --force force some actions that would fail otherwise（网易翻译：强制执行一些否则会失败...

[root@izwz97473w2ydu1pgsmzk4z test]# cut -f 2 student.txt NAME1 furong F 562 fengjie F 763 cang F 99[root@izwz97473w2ydu1pgsmzk4z test]# vim student.txt [root@i...

可能前几篇博客中有提到过，.（点，太小了可能看不清）代表source# .bash_profile# Get the aliases and functionsif [ -f ~/.bashrc ]; then . ~/.bashrcfi# User specific environment and startup programsPATH=$PATH:$H...

这种条件判断不会进行太复杂的条件判断，只判断是否有权限，而不会是哪一个用户才有这种权限。硬链接：https://baike.sogou.com/v63228740.htm?fromTitle=硬链接来源于搜狗百科[root@izwz97473w2ydu1pgsmzk4z test]# lltotal 8-rw-r--r-- 1 root root 64 Aug 1...

awk: cmd. line:1: ^ unexpected newline or end of string[root@localhost shelltest]# df -h | grep centos-root | awk{printf $4}-bash: awk{printf: command not found[root@localhost shelltest]# df...

两个前置知识点：$（date+%F）mysqldump用法https://baijiahao.baidu.com/s?id=1612955427840289665&wfr=spider&for=pc

which命令：-https://www.cnblogs.com/huchong/p/9938426.htmlhttps://www.cnblogs.com/300js/p/9133352.html关于$RANDOMhttps://www.cnblogs.com/gaoyuechen/p/8000810.htmlshell脚本中怎么用从文件中逐行的读取数据while read ...

[root@localhost shelltest]# ./ifdir.sh Please input your direct: /homeyou are right!#!/bin/bashread -p "Please input your direct: " -t 10 dif [ -d "$d" ] then echo "you are r...

#!/bin/bashread -p "Please input tour name : " -t 30 namecase $name in "Finley") echo "Hello,Finley ,welcome !!" ;; "Linjuan") echo...

注意事项设置分为两种：第一种是在本地上配置，第二种是连接远程终端。[root@izwz97473w2ydu1pgsmzk4z mytemp]# rpm -qa |grep vim vim-filesystem-7.4.160-6.el7_6.x86_64 vim-enhanced-7.4.160-6.el7_6.x86_64 vim-minimal-7.4.160-6.el7_6...

shell高亮显示echo字体颜色设置：https://blog.youkuaiyun.com/panpan639944806/article/details/23930553https://www.cnblogs.com/linusflow/p/7399761.html- 使用\033与\33的区别字体颜色（演示效果以40黑色为背景）-背景色颜色-如果只是想设置字体颜色，并...

=~shell中if匹配的标准格式，支持正则匹配############################################################################################## File Name: monitor_man.sh# Author: Finley# mail: 2306952220@qq.com# Create T...

free命令详解：https://blog.youkuaiyun.com/yexiang优快云/article/details/80736588https://www.cnblogs.com/williamjie/p/9233867.html

自定义变量等号左右两侧，不能加空格[root@izwz97473w2ydu1pgsmzk4z shell]# set -u[root@izwz97473w2ydu1pgsmzk4z shell]# echo $tt-bash: tt: unbound variable[root@izwz97473w2ydu1pgsmzk4z shell]# `` - unset...

系统变量命名：由于系统中可能会发生命令跟环境变量冲突的情况，一般情况下，自定义的环境变量最好大写（Linux命令全部是小写）。[root@izwz97473w2ydu1pgsmzk4z ~]# echo $PATH/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/jdk1.7.0_79/bin:/usr/local...

原创：FreeOpsFreeOps7月31日随着信息化的发展，人们接触到的网络系统越来越多，在每个系统中都会设置相应的登录密码，运维工作人员在系统运维过程中会接触更多系统的登录账户及密码。账户过多，忘记密码难以避免。今天分享在Centos操作系统中忘记root后的处理方法。由于Centos6与Centos7紧急修改root登录密码相差较大，目前常用的操作系统多见于Centos7。...