linux系统特性
系统级命令
[root@VM-4-3-centos ~]# uname -a
Linux VM-4-3-centos 3.10.0-1127.19.1.el7.x86_64 #1 SMP Tue Aug 25 17:23:54 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
# yuml源
[root@VM-4-3-centos ~]# cat /etc/yum.repos.d/CentOS-Base.repo
[extras]
gpgcheck=1
gpgkey=http://mirrors.tencentyun.com/centos/RPM-GPG-KEY-CentOS-7
enabled=1
baseurl=http://mirrors.tencentyun.com/centos/$releasever/extras/$basearch/
name=Qcloud centos extras - $basearch
[os]
gpgcheck=1
gpgkey=http://mirrors.tencentyun.com/centos/RPM-GPG-KEY-CentOS-7
enabled=1
baseurl=http://mirrors.tencentyun.com/centos/$releasever/os/$basearch/
name=Qcloud centos os - $basearch
[updates]
gpgcheck=1
gpgkey=http://mirrors.tencentyun.com/centos/RPM-GPG-KEY-CentOS-7
enabled=1
baseurl=http://mirrors.tencentyun.com/centos/$releasever/updates/$basearch/
systemd
# 初始化进程
1、Bois开机自检
2、启动菜单
3、加载系统内核
4、内核初始化
5、初始化进程
# 包含定时任务管理
# 分时日月周
[root@VM-4-3-centos ~]# crontab -l
*/1 * * * * flock -xn /tmp/stargate.lock -c '/usr/local/qcloud/stargate/admin/start.sh > /dev/null 2>&1 &'
0 0 * * * /usr/local/qcloud/YunJing/YDCrontab.sh > /dev/null 2>&1 &
# systemctl
systemctl daemon-reload 重新加载sys服务
systemctl status nginx 查看服务状态
systemctl start nginx 启动服务状态
bash解释器
# root用户是#结尾
$ 普通用户是$结尾
ctrl + a 到光标最前面
ctrl + e 到光标最后面
# 别名的使用
[root@VM-4-3-centos ~]# alias ife='ifconfig eth0'
[root@VM-4-3-centos ~]#
[root@VM-4-3-centos ~]#
[root@VM-4-3-centos ~]#
[root@VM-4-3-centos ~]# ife
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.4.3 netmask 255.255.252.0 broadcast 10.0.7.255
inet6 fe80::5054:ff:fec7:4f19 prefixlen 64 scopeid 0x20<link>
ether 52:54:00:c7:4f:19 txqueuelen 1000 (Ethernet)
RX packets 18969317 bytes 7073523514 (6.5 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 15745568 bytes 2759728910 (2.5 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
# "" ''的区别
''所见即所得
# 环境变量的文件
[root@VM-4-3-centos ~]# cat /etc/profile
# /etc/profile
# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc
# It's NOT a good idea to change this file unless you know what you
# are doing. It's much better to create a custom.sh shell script in
# /etc/profile.d/ to make custom changes to your environment, as this
# will prevent the need for merging in future updates.
[root@VM-4-3-centos ~]# source /etc/profile
# 批量删除
[root@VM-4-3-centos ~]# rm file/{1.sh-md5.txt,3.txt}
rm: remove regular file ‘file/1.sh-md5.txt’? y
rm: remove regular file ‘file/3.txt’? y
stat
# 查看文件和文件夹的详细信息
一般文件是644
文件夹是755
wget和curl
[root@VM-4-3-centos ~]# wget www.baidu.com -O baidu.txt
--2023-09-04 11:28:54-- http://www.baidu.com/
Resolving www.baidu.com (www.baidu.com)... 153.3.238.102, 153.3.238.110
Connecting to www.baidu.com (www.baidu.com)|153.3.238.102|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2381 (2.3K) [text/html]
Saving to: ‘baidu.txt’
100%[==========================================================================================================>] 2,381 --.-K/s in 0s
2023-09-04 11:28:54 (290 MB/s) - ‘baidu.txt’ saved [2381/2381]
[root@VM-4-3-centos ~]#
[root@VM-4-3-centos ~]# curl www.baidu.com
<!DOCTYPE html>
<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');</script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>©2017 Baidu <a href=http://www.baidu.com/duty/>使用百度前必读</a> <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a> 京ICP证030173号 <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
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