linux檢視java jdk安裝路徑和設定環境變數                   

echo $PATH

二：下面是配置linux的環境變數：(記得source .bash_profile) . 修改/etc/profile檔案 （全域性所有使用者）

vi 此檔案/etc/profile 在profile檔案末尾加入：

vi 此檔案/etc/profile
在profile檔案末尾加入：
export JAVA_HOME=/usr/share/jdk1.6.0_20
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
.修改.bash_profile檔案 （某個使用者許可權使用這些環境變數）
.bash_profile檔案末尾加入：

export JAVA_HOME=/usr/share/jdk1.6.0_20
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
.shell終端執行下列命令： （臨時用）
export JAVA_HOME=/usr/share/jdk1.6.0_14
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

 三. 解除安裝jdk ·找到jdk安裝目錄的_uninst子目錄 ·在shell終端執行命令./uninstall.sh即可解除安裝jdk。

Linux 系統如何檢視系統配置資訊

一：檢視cpu
[[email protected] /]# more /proc/cpuinfo | grep "model name"
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
model name       : Intel(R) Xeon(R) CPU            X3220 @ 
 
2.40GHz
[[email protected] /]# grep "model name" /proc/cpuinfo
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
model name       : Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
[[email protected] /]# grep "model name" /proc/cpuinfo | cut -f2 -d:
Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz
Intel(R) Xeon(R) CPU            X3220 @ 2.40GHz

二：檢視記憶體
[[email protected] /]# grep MemTotal /proc/meminfo
MemTotal:        614400 kB
[[email protected] /]# free -g
[[email protected] /]# free -m
               total        used        free      shared     buffers      cached
Mem:            600          23         576           0           0           0
-/+ buffers/cache:          23         576
Swap:             0           0           0
[[email protected] /]# free -m |grep "Mem" | awk '{print $2}'
600[[email protected] /]#grep MemTotal /proc/meminfo | cut -f2 -d:
614400 kB
(k|K|m|M) 以k|kB|m|MB為單位顯示,對應轉換(1000|1024|1000000|1048576)

三：檢視CPU位數(32 or 64)
[[email protected] /]# getconf LONG_BIT
32

四：檢視linux版本
[[email protected] /]# more /etc/redhat-release
CentOS release 5 (Final)
[[email protected] /]# more /etc/issue
CentOS release 5 (Final)
Kernel \r on an \m

[[email protected] /]# more /proc/version
Linux version 2.6.18-92.1.18.el5.028stab060.2PAE ([[email protected]32-build-xemul][email protected]32-build-xemul[/email]) (gc
c version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Tue Jan 13 12:31:30 MSK 2009
五：檢視核心版本
[[email protected] /]# uname -r
2.6.18-92.1.18.el5.028stab060.2PAE
[[email protected] /]# uname -a
Linux srv.eddiechen.cn 2.6.18-92.1.18.el5.028stab060.2PAE #1 SMP Tue Jan 13 12:31:30 MSK 2009 i686 i686 i386 GNU/Linux
六：檢視時區
[[email protected] /]# date -R
Wed, 25 Feb 2009 02:20:50 +0000
[[email protected] /]# mv /etc/localtime /etc/localtime.save
[[email protected] /]# cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[[email protected] /]# date -R
Wed, 25 Feb 2009 10:24:26 +0800
七：主機名
[[email protected] /]# hostname
srv.eddiechen.cn
八：檢視selinux情況
[[email protected] /]# sestatus
SELinux status:                  disabled
九：網路
IP
[[email protected] /]# ifconfig    | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'
207.154.202.216
閘道器
[[email protected] /]# cat /etc/sysconfig/network
NETWORKING="yes"
GATEWAY="192.0.2.1"
HOSTNAME="srv.eddiechen.cn"
dns
[[email protected] /]# cat /etc/resolv.conf
nameserver 208.74.168.131
nameserver 208.74.168.132
nameserver 4.2.2.1
十：已經安裝的軟體包
[[email protected] /]# rpm -qa | wc -l
197
[[email protected] /]# yum list installed | wc -l
198
十一：磁碟和分割槽
[[email protected] /]# df -h
Filesystem             Size       Used             Avail Use      %      Mounted on
/dev/simfs              10G     353M              9.7G          4%      /
[[email protected] /]# du -sh
353M
[[email protected] /]# du /etc -sh
4.6M     /etc