Linux 常用命令大全
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测试端口连通性的命令
telnet ip port # 开放 [appuser&dp-core-bat ~]$ telnet 10.172.123.253 28080 Trying 10.172.123.253... Connected to 10.172.123.253 # 未开放 [appuser&dp-core-bat ~]$ telnet 10.172.123.253 28081 Trying 10.172.123.253... telnet: connect to address 10.172.123.253: Connection refused
ssh -v -p port ip # 说明: v 调试模式(会打印日志) p 指定端口 username:远程主机的登录用户 ip:远程主机 # 开放的端口 C:\WINDOWS\system32>ssh -v -p 28080 10.172.123.253 OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5 debug1: Connecting to 10.172.123.253 [10.172.123.253] port 28080. debug1: Connection established # 未开放的端口 C:\WINDOWS\system32>ssh -v -p 28080 10.172.123.253 OpenSSH_for_Windows_7.7p1, LibreSSL 2.6.5 debug1: Connecting to 10.172.123.253 [10.172.123.253] port 28081. debug1: connect to address 10.172.123.253 port 28081: Connection refused ssh: connect to host 10.172.123.253 port 28081: Connection refused
curl ip:port # 开放的端口 [appuser&dp-core-bat ~]$ curl 10.172.123.253 28080 <HTML> <HEAD> <TITLE>Error 404 - Not Found<TITLE> <BODY> </BODY> </HTML> # 未开放的端口 [appuser&dp-core-bat ~]$ curl 10.172.123.253 28081 curl: (7)Failed connect to 10.172.123.253:28081; Connection refused
wget ip:port # 开放的端口 wget 10.172.123.253:28080 Connecting to 1.1.1.1:8000... connected.
# 未开放的端口 wget 10.172.123.253:28081 failed: Connection timed out. Retrying.
tcping # 这是个第三方工具，下载地址 tcping.exe - ping over a tcp connection。这个工具还可以用来测试TCP的延迟。在官网下载下载 tcping.exe, 复制到 ‘C:\Windows\System32’ 就可以在cmd里面用了。 # 用法 tcping ip port
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开放指定端口
1、开启防火墙 systemctl start firewalld 2、开放指定端口
# 暂时开放ftp服务 firewall-cmd --zone=public --add-port=指定端口号/tcp --zone ：作用域 --add-port: 添加端口 # 永久开放ftp服务 firewall-cmd --zone=public --add-port=指定端口号/tcp --permanent #永久关闭 firewall-cmd --remove-service=ftp --permanent
3、重新加载防火墙配置 firewall-cmd --reload 4、查看端口号 netstat -ntlp # 查看所有tcp端口 netstat -ntulp | grep 8010 # 查看8010端口的使用情况 # 补充： #查看防火墙运行状态 firewall-cmd --state # 关闭防火墙 systemctl stop firewalld
# 启用防火墙
systemctl enable firewalld# 永久停用防火墙
systemctl disable firewalld
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查看Linux 系统型号、版本
[postgres@ecs-22090803 .ssh]$ uname -a Linux ecs-22090803 3.10.0-1160.53.1.el7.x86_64 #1 SMP Fri Jan 14 13:59:45 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux [postgres@ecs-22090803 .ssh]$ cat /proc/version Linux version 3.10.0-1160.53.1.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) ) #1 SMP Fri Jan 14 13:59:45 UTC 2022 [postgres@ecs-22090803 .ssh]$ cat /etc/redhat-release CentOS Linux release 7.6.1810 (Core)
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给文件夹或者文件 添加一个用户权限
chown -R alg /data # -R 递归目录 alg 是用户名
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修改文件夹或者文件的权限
chmod -R 777 文件夹
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chmod无权限——八种解决办法
直接运行加载程序，并将其传递给想要运行的命令
[root@localhost ~]# /lib64/ld-linux-x86-64.so.2 /bin/chmod 755 /bin/chmod [root@localhost ~]# ll /bin/chmod -rwxr-xr-x. 1 root root 48712 Oct 15 2014 /bin/chmod
加载程序路径可能不同，32位系统应该是/lib/ld-linux.so，我没有测试
