Tuesday, August 21, 2012

Daily use weblogic admin Linux Commands ?

To view System Resource Information

uname --help

uname -r

grep model /proc/cpuinfo

grep MemFree /proc/meminfo

sudo -u root lastcomm -f /var/account/pacct

cat /proc/version

# cat /proc/cpuinfo

# cat /proc/meminfo

# cat /proc/zoneinfo

# cat /proc/mounts

cat /etc/redhat-release

grep MemTotal /proc/meminfo

grep SwapTotal /proc/meminfo

df -k /tmp

grep "model name" /proc/cpuinfo

ifconfig (/sbin/ifconfig)

uaname -r

lshal:detected hardware

rpm -qa:  display pakage

rpm -qa | less

Linux Kernel Information:

cat /etc/sysctl.conf

cat /etc/hosts


Uname -r

cat /etc/security/limits.conf

cat /proc/sys/kernel/sem

cat /proc/sys/kernel/shmmax

cat /proc/sys/kernel/shmall

cat /proc/sys/kernel/shmmni

cat /proc/sys/fs/file-max

cat /proc/sys/net/ipv4/ip_local_port_range


cat /etc/issue

sysctl -a | grep shm

sysctl -a | grep ip_local_port_range

/etc/inittab:  init process determines which runlevel it should be

w, ps -a, ps -Alf, ps -AlFH, ps -AlLm

ps -u oracle, ps -u anguyen

Commands to monitor bottlenecks such as Disk, Memory / CPU/Network, or System Activity:

top ? t, m, A: top consumer, r: renice, o: interactively select

vmstat 3, vmstat -m:memority slab info, vmstat -a

w, ps -a, ps -Alf, ps -AlFH, ps -AlLm

ps -u oracle, ps -u attunity



fee -s 2

watch -n 3 -d free

watch -d cat /proc/meminfo

sar -B -f /var/log/sa/sa14

sar -W -f /var/log/sa/sa14

vmstat -m

vmstat -a

ipcs -sm

ipcs -lms

sar -n DEV | more

sar 4 5

mpstat -P ALL

MEMORY intensive process:

ps -e -o pmem,pid,user,tty,args | grep -i oracle | sort -n -k 1 -r | head

watch -n 3 -d free

watch -d cat /proc/meminfo

CPU intensive process


ps -e -o pcpu,pid,user,tty,args | sort -n -k 1 -r | head

mpstat -P 0 2 20 (processor 0

mpstat -P ALL

sar -u -f

Disk Storage

iostat -d 3, iostat 2 15

iostat -xd 10

sorting files by size

ls -alS | head -5

mpstat -P ALL

sar 4 5


lsmod | grep -i bonding

cat /etc/sysconfig/network-scripts/ifcfg-eth0 (check bonding)..the difference NETWORK, IPADDRESS, NETMASK

netstat -s | less

netstat --interfaces eth0

netstat -ptc

sar -n DEV

netstat -nat | awk '{ print $5}' | cut -d: -f1 | sed -e '/^$/d' | uniq

tcpdump -n -i eth1 -s 0 -w output.txt src or dst port 80

iptraf - Real-time Network Statistics

Network traffic

netstat -ptc

sar -n DEV

sar - Collect and Report System Activity


cpio -idmv < 10201_database_linux_x86_64.cpio

id oracle

id nobody

pgrep sshd

env | grep PATH

detected hardware lshal:

init process determines which runlevel it should be /etc/inittab


shutdown -t3 -r now

mount /dev/hda4 /data/oracle/bkup1:

 grep ‘Ashley Nguyen’ /etc/passwd

find / -name install.log

sed ‘s/anguyen/lvu/’ /etc/passwd > /tmp/test

ps aux | grep nfs


Ifconfig -a

To determine the amount of shared memory available, enter the following command:automatic memory management

# df -k /dev/shm/

To determine the distribution and version of Linux installed, enter the following command:

# cat /proc/version

To determine whether the required packages are installed, enter commands similar to the following:

# rpm -q package_name

Add group

# /usr/sbin/groupadd oper

Modify user:  usermod -g oinstall -G dba oracle

Create disks:

fdisk -l

give password to oracle user

passwd oracle

change ownership in linux


clear screen


TAR - backup / restore

tar -cf myfiles.tar *.trc (create)

tar xvf myfiles.tar (extract)

tar tvf myfiles.tar (show the details)

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