CentOS 基本命令

查看服务器位数
getconf LONG_BIT
查看linux版本
uname -a
cat /etc/redhat-release

查看已安装软件(分rpm/deb/yum包安装的)
rpm -qa
dpkg -l
yum list installed
yum list installed | grep anaconda

环境变量

#显示环境变量HOME
echo $HOME
#设置新环境变量
export HELLO="Hello!"
echo $HELLO
#使用env命令显示所有的环境变量
env | grep TEST
#使用set命令显示所有本地定义的 Shell 变量
#使用unset命令来清除环境变量
#set可以设置某个环境变量的值。清除环境变量的值用unset命令。如果未指定值，则该变量值将被设为 NULL
unset $TEST
#使用readonly命令设置只读变量
export TEST="Test..."     #增加一个环境变量TEST
readonly TEST             #将环境变量TEST设为只读
unset TEST                 #会发现此变量不能被删除
    -bash: unset: TEST: cannot unset: readonly variable
TEST="New"                 #会发现此也变量不能被修改
    -bash: TEST: readonly variable
#环境变量的设置位于 /etc/profile【对所有用户生效(永久的)】和.bash_profile【对单一用户生效(永久的)】
#如果需要增加新的环境变量可以添加下属行
#vi /etc/profile
export path=$path:/path1:/path2:/pahtN
source /etc/profile

#vim /home/guok/.bash_profile   #guok用户的环境变量
export path=$path:/path1:/path2:/pahtN
source /home/guok/.bash_profile

command not found

-bash: uname: command not found

#Debian
apt-get install coreutils

#Ubuntu
apt-get install coreutils

#Alpine
apk add coreutils

#Arch Linux
pacman -S coreutils

#Kali Linux
apt-get install coreutils

#CentOS
yum install coreutils

#Fedora
dnf install coreutils

#OS X
brew install coreutils

#Raspbian
apt-get install coreutils

#Docker
docker run cmd.cat/uname uname

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 -bash: arch: command not found

#Debian
apt-get install coreutils
 
#Ubuntu
apt-get install coreutils
 
#Alpine
apk add coreutils
 
#Arch Linux
pacman -S mailman
 
#Kali Linux
apt-get install coreutils
 
#CentOS
yum install coreutils
 
#Fedora
dnf install coreutils
 
#OS X
brew install coreutils
 
#Raspbian
apt-get install coreutils
 
#Docker
docker run cmd.cat/arch arch

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-bash: uptime command not found

#Debian
apt-get install procps
 
#Ubuntu
apt-get install procps
 
#Alpine
apk add procps
 
#Arch Linux
pacman -S procps-ng
 
#Kali Linux
apt-get install procps
 
#CentOS
yum install procps-ng
 
#Fedora
dnf install procps-ng
 
#Raspbian
apt-get install procps
 
#Docker
docker run cmd.cat/uptime uptime

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