Linux(CentOS7) 常用命令（防火墙，用户组，MD5等）

base

# 获取函数返回值或者上一个命令的退出状态
md5sum -c --status filename.md5
echo $?

# 获取结果的第 1 行，第 2 列
ps -ef | grep tomcat | sed -n '1p' | awk '{print $2}'
ps -ef | grep tomcat | awk 'NR==1' | awk '{print $2}'
ps -ef | grep tomcat | grep -v 'grep.*color=auto' | awk '{print $2}'

# 命令输出结果作为输入参数
ps -ef | grep tomcat | grep -v 'grep.*color=auto' | awk '{print $2}' | xargs kill -9

end

shell 常用设置命令

# 关闭防火墙
systemctl stop firewalld.service
systemctl disable firewalld.service

# 替换阿里 yum 源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
yum makecache

# 安装 vim
yum -y install vim

# 关闭连接 ssh 时的 DNS 查询
sed -i 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
sed -i 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
systemctl restart sshd

# 关闭 selinux
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

# 关闭系统提示音
sed -i 's/#set bell-style none/set bell-style none/g' /etc/inputrc

# 关闭 Vim 提示音
# sed -i '$asetterm -blength 0' /etc/bashrc
echo ':set vb t_vb=' > ~/.vimrc

end

用户，用户组

# 修改文件或文件夹所属的用户和用户组
chown -R jenkins:jenkins ./jenkins/

# 修改文件或文件夹的权限
chmod -R 0777 ./jdk1.8.0_251/

# 查看所有用户
# cat /etc/passwd | grep -v nologin | grep -v halt | grep -v shutdown | awk -F":" '{ print $1"|"$3"|"$4 }' | more
cat /etc/passwd
# jenkins:x:998:996:Jenkins Automation Server:/var/lib/jenkins:/bin/false

# 修改用户目录
usermod -d /opt/jenkins/ -u 998 jenkins
# jenkins:x:998:996:Jenkins Automation Server:/opt/jenkins/:/bin/false

end

MD5

# 查看文件 md5 值
md5sum filename

# 查看文件 sha1 值
sha1sum filename

# 查看文件 sha256 值
sha256sum filename

# 查看当前目录下所有文件的 md5 值
md5sum *

end

C 环境

yum install -y cmake gcc gcc-c++ gdb

# 新版 cmake
# 下载 https://cmake.org/download/
# https://github.com/Kitware/CMake/releases
wget -O /opt/cmake-3.17.3.tar.gz  https://github.com/Kitware/CMake/releases/download/v3.17.3/cmake-3.17.3.tar.gz
cd /opt/
tar -zxf cmake-3.17.3.tar.gz
mv cmake-3.17.3 cmake-3.17.3-src
cd cmake-3.17.3-src/
# 或者 Install an OpenSSL development package
vim CMakeLists.txt
添加 set(CMAKE_USE_OPENSSL OFF)
# 配置安装路径
./bootstrap --prefix=/opt/cmake-3.17.3
# 编译安装
make && make install

# 新版本 gdb
# 下载
curl -o /opt/gdb-8.3.1.tar.gz  https://mirrors.ustc.edu.cn/gnu/gdb/gdb-8.3.1.tar.gz
cd /opt/
tar -zxf gdb-8.3.1.tar.gz
mv gdb-8.3.1 gdb-8.3.1-src
cd gdb-8.3.1-src/
# 配置安装路径
./configure --prefix=/opt/gdb-8.3.1
# 编译安装
make && make install

end

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https://www.cnblogs.com/jhxxb/p/10573957.html