Linux Commands

Create new mount point linux

Make new directory for allocate new mount point

mkdir /u01

Edit fstab file for automount

vi /etc/fstab

Add lines
dev/sdb1               /u01                    ext3    defaults        1 2

Make ext3 file system

mkfs.ext3 /dev/sdb1

mount -t ext3 /dev/sdb1 /u01

[root@siebelds ~]# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      46597048  19489468  24702412  45% /
/dev/sda1               101086     12860     83007  14% /boot
tmpfs                  4087328         0   4087328   0% /dev/shm
/dev/sdb1            309633052    195552 293709064   1% /u01

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How do we check folder  size in Linux environment

[oracle@siebelpoc previous]$ du -ch|grep total
586M    total

[oracle@siebelpoc previous]$

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Copy files from linux to  linux machine

[oracle@siebelpoc install]$ scp *.zip oracle@ipaddress:/u01/install
The authenticity of host 'ipaddress (ipaddress)' can't be establishe                                                                                       d.
RSA key fingerprint is 99:f8:ee:0f:98:40:0b:a5:bd:b6:a5:24:cc:3a:3f:5f                                                                                       .
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ipaddress' (RSA) to the list of known hos                                                                                       ts.
oracle@ipaddress's password:
V17530-01_1of2.zip                                                                                                         100% 1182MB  11.2MB/s   01:46
V17530-01_2of2.zip                                                                                                         100% 1060MB  11.3MB/s   01:34
[oracle@siebelpoc install]$
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Increase Swap space

df -m

dd if=/dev/zero of=/extraswap bs=1M count=16384

mkswap /extraswap

swapon /extraswap

cp /etc/fstab /etc/fstab.backup

vi /etc/fstab

Add lines

/extraswap              swap                    swap    defaults        0 0

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Zip & Unzip folder

If you want zip folder

tar -pczf inst.tar.gz ERPTRNG/inst

If you want unzip folder

test.cpio.gz

gunzip test.cpio.gz

cpio -idmv < test.cpio

2.unzip folder

unzip test.zip

unzip particular folder

unzip test.zip -d database

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fstab failed during reboot

If you changed unwanted things in fstab files, when you’re doing reboot activity later on, It should not be work. so in this case , you need to edit the fstab files but here problem was faced, you can’t edit fstab file on read write mode, so you need to mount read write option like below and do it on terminal windows and reboot it.

mount -o remount,rw /

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Putty installation on Linux

Download putty package from here

http://pkgs.org/centos-5-rhel-5/rpmforge-x86_64/putty-0.61-1.el5.rf.x86_64.rpm.html

and then install it.

 rpm -Uvh putty-0.61-1.el5.rf.x86_64.rpm
warning: putty-0.61-1.el5.rf.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
Preparing...                ########################################### [100%]
   1:putty                  ########################################### [100%]
Go to --> Applications --> Internet --> Putty terminal client.
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Change network ip address

[root@siebelpoc ~]# system-config-network-tui

Enter

Select your ethernet & Enter

Change the ip address

After change it. restart network service.

 [root@siebelpoc ~]# service network restart

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Bash Shell Script 10 Seconds Guide

Bash Shell script guide

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Find out Gateway and Domain name service

Gateway

[root@netbackuptest ~]# netstat -rn

DNS

[root@netbackuptest ~]# cat /etc/resolv.conf

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Linux Command line sheet :

http://www.cheatography.com/davechild/cheat-sheets/linux-command-line/

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How many lines occupied in your file Linux?

wc -l <filename location>

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To view information about the current partition layout
cat /proc/partitions | grep hd
SCSI
cat /proc/partitions | grep sd

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How to determine cpu cores

cat /proc/cpuinfo |grep “cpu cores”|uniq

cat /proc/cpuinfo |grep “core id”|sort -u

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