判断当前 Linux 的发行版本
前一段时间做部署脚本的依赖安装，碰壁了不少，但最后也有值得记录的经验。
判断当前系统版本
- 网上给的一种方法，我没有使用
#!/bin/bash Get_OS_Name() { if grep -Eqi "CentOS" /etc/issue || grep -Eq "CentOS" /etc/*-release; then DISTRO='CentOS' PM='yum' elif grep -Eqi "Red Hat Enterprise Linux Server" /etc/issue || grep -Eq "Red Hat Enterprise Linux Server" /etc/*-release; then DISTRO='RHEL' PM='yum' elif grep -Eqi "Aliyun" /etc/issue || grep -Eq "Aliyun" /etc/*-release; then DISTRO='Aliyun' PM='yum' elif grep -Eqi "Fedora" /etc/issue || grep -Eq "Fedora" /etc/*-release; then DISTRO='Fedora' PM='yum' elif grep -Eqi "Debian" /etc/issue || grep -Eq "Debian" /etc/*-release; then DISTRO='Debian' PM='apt' elif grep -Eqi "Ubuntu" /etc/issue || grep -Eq "Ubuntu" /etc/*-release; then DISTRO='Ubuntu' PM='apt' elif grep -Eqi "Raspbian" /etc/issue || grep -Eq "Raspbian" /etc/*-release; then DISTRO='Raspbian' PM='apt' else DISTRO='unknow' fi echo $DISTRO; } Get_OS_Name - 我使用的方法
# System judgement if [ -s /etc/oracle-release ] then OS="Oracle" elif [ -s /etc/SuSE-release ] then OS="SuSE" elif [ -f /etc/centos-release ] then OS="CentOS" elif [ -s /etc/redhat-release ] then OS="RedHat" elif [ -r /etc/os-release ] then grep 'NAME="Ubuntu"' /etc/os-release > /dev/null 2>&1 if [ $? == 0 ] then OS="Ubuntu" fi else OS="Unknown Linux" fi
使用方法
# Dependcies Installation
if [ $OS == "CentOS" ]
then
yum update && \
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel \
sqlite-devel readline-devel tk-devel gdbm-devel db4-devel \
libpcap-devel xz-devel -y
elif [ $OS == "Ubuntu" ]
then
apt-get update -y && \
apt-get install -y make build-essential libssl-dev zlib1g-dev \
libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm \
libncurses5-dev xz-utils tk-dev libxml2-dev libxmlsec1-dev \
libffi-dev liblzma-dev bison -y
fi
# Nodejs Environment Installation
command -v npm >> /dev/null
if [ $? -ne 0 ]
then
if [ $OS == "Ubuntu" ]
then
curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -
apt-get install -y nodejs
elif [ $OS == "CentOS" ]
then
curl --silent --location https://rpm.nodesource.com/setup_10.x | bash -
yum install -y nodejs
fi
fi
获取服务器信息
网上找的代码，改了改测试了一下可以用
#!/bin/bash
Line='==========='
#linux发行版名称
if [[ -f /usr/bin/lsb_release ]]; then
OS=$(/usr/bin/lsb_release -a |grep Description |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
else
OS=$(cat /etc/issue |sed -n '1p')
fi
echo -e "${Line}\nOS:\n${OS}\n${Line}"
######################################################################################################
#查看系统是否为64位：uname -m，若出现x86_64，则为64位
OS_version=$(uname -m)
echo -e "OS_version:\n${OS_version}\n${Line}"
#系统内核版本
kernel_version=$(uname -r)
echo -e "Kernel_version:\n${kernel_version}\n${Line}"
#cpu型号
CPU=$(grep 'model name' /proc/cpuinfo |uniq |awk -F : '{print $2}' |sed 's/^[ \t]*//g' |sed 's/ \+/ /g')
echo -e "CPU model:\n${CPU}\n${Line}"
#物理cpu个数
Counts=$(grep 'physical id' /proc/cpuinfo |sort |uniq |wc -l)
echo -e "Total of physical CPU:\n${Counts}\n${Line}"
#物理cpu内核数
Cores=$(grep 'cpu cores' /proc/cpuinfo |uniq |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
echo -e "Number of CPU cores\n${Cores}\n${Line}"
#逻辑cpu个数
PROCESSOR=$(grep 'processor' /proc/cpuinfo |sort |uniq |wc -l)
echo -e "Number of logical CPUs:\n${PROCESSOR}\n${Line}"
#查看CPU当前运行模式是64位还是32位
Mode=$(getconf LONG_BIT)
echo -e "Present Mode Of CPU:\n${Mode}\n${Line}"
#查看CPU是否支持64位技术：grep 'flags' /proc/cpuinfo，若flags信息中包含lm字段，则支持64位
Numbers=$(grep 'lm' /proc/cpuinfo |wc -l)
if (( ${Numbers} > 0)); then lm=64
else lm=32
fi
echo -e "Support Mode Of CPU:\n${lm}\n${Line}"
######################################################################
#Memtotal 内存总大小
Total=$(cat /proc/meminfo |grep 'MemTotal' |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
echo -e "Total Memory:\n${Total}\n${Line}"
#系统支持最大内存
Max_Capacity=$(dmidecode -t memory -q |grep 'Maximum Capacity' |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
echo -e "Maxinum Memory Capacity:\n${Max_Capacity}\n${Line}"
#查看内存类型、频率、条数、最大支持内存等信息：dmidecode -t memory，或dmidecode | grep -A16 "Memory Device$"
#下面为统计内存条数
Number=$(dmidecode | grep -A16 "Memory Device$" |grep Size|sort |sed 's/^[ \t]*//g'| grep -v 'No Module Installed' | wc -l)
echo -e "Number of Physical Memory:\n${Number}\n${Line}"
#SwapTotal swap分区总大小
SwapTotal=$(cat /proc/meminfo |grep 'SwapTotal' |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
echo -e "Total Swap:\n${SwapTotal}\n${Line}"
#Buffers size
Buffers=$(cat /proc/meminfo |grep 'Buffers' |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
echo -e "Buffers:\n${Buffers}\n${Line}"
#Cached size
Cached=$(cat /proc/meminfo |grep '\<Cached\>' |awk -F : '{print $2}' |sed 's/^[ \t]*//g')
echo -e "Cached:\n${Cached}\n${Line}"
#空闲内存 + buffers/cache
Available=$(free -m |grep - |awk -F : '{print $2}' |awk '{print $2}')
echo -e "Available Memory:\n${Available} MB\n${Line}"
#显示硬盘，以及大小
Disk=$(fdisk -l |grep 'Disk' |awk -F , '{print $1}' | sed 's/Disk identifier.*//g' | sed '/^$/d')
echo -e "Amount Of Disks:\n${Disk}\n${Line}"
#各挂载分区使用情况
Partion=$(df -hlP |sed -n '2,$p')
echo -e "Usage Of partions:\n${Partion}\n${Line}"
题外话：修改 Ubuntu 的默认 Shell 为 Bash
有的时候编写 Shell 脚本，在Ubuntu上总是莫名其妙地碰到各种问题，这里小记一下。
交互方式
# dpkg-reconfigure dash
命令行方式
# ln -s /bin/bash /bin/sh
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