User Quota Creation

Step1: #vim /etc/fstab
add usrquota in the /home partition after defaults,usrquota
Step2: #mount -o remount /home
Step3: #quotacheck -cf /home
Step4: #quotaon /home
Step5: #repquota /home
Step6: #edquota pna - edit the quota for the user pna ( give the soft and hard limitations)
Step7: #repquota /home (It will show the quota for the user pna)

Adding kickstart file in the remote boot screen itself

Edit the following file:


#vim /tftpboot/pxelinux.cfg/default

Add the follwoing line in the file:

label ks
kernel vmlinuz
append initrd=initrd.img ks=nfs:192.168.0.254:/var/ftp/pub/ks.cfg

Adding another OS in this file (example: rhel6):

label 6
kernel rhel6/vmlinuz
append initrd=rhel6/initrd.img ks=nfs:192.168.0.254:/var/ftp/pub/rhel6/ks.cfg

Compression & Backup

gzip:
1.#seq 100000 > 1lakh.txt (creating a file with the content 100000)
2.#gzip -c 1lakh.txt > 1lakh.txt.gz (compressing the file)
3.#gzip -l 1lakh.txt.gz  (showing the compression rate)
4.#gunzip 1lakh.txt.gz (uncompress the file)
5.#zcat 1lakh.txt.gz (view the content without decompressing)
or
#zcat 1lakh.txt.gz | less

bzip2: (best compression)
6.#bzip2 -c 1lakh.txt > 1lakh.txt.bz2 (compressing using algorithm bzip2)
7.#bzcat 1lakh.txt.bz2  (view the content without decompressing)
or
#bzcat 1lakh.txt.bz2 |less
8.#bunzip2 1lakh.txt.bz2  (decompressing using bzip2)

Zip:
9.#zip 1lakh.txt.zip 1lakh.txt (compressing using zip)
10.#unzip 1lakh.txt.zip (uncompress the file)

Tar & Gzip, Bzip2 (Tape Drive Archieve or backup):

create a directory special and put some contents in that.

11.#tar -cvf myfile.tar special/ (taking backup)

12.#tar -cvf myfile.tar 1lakh.txt.gz (adding another file in the same tar)

13.#tar -czvf myfile.tar.gz special/ (creating tar & gzip together)

14.#tar -cjvf myfile.tar.bz2 special/ (creating tar & bzip2 together)

15.#tar -tzvf myfile.tar.gz (viewing the gzip without extraction)

16.#tar -cjvf myfile.tar.bz2 special.save/ (viewing the files)

17.#tar -xvf myfile.tar.gz (extracting gzip file)

18.#tar -xvf myfile.tar.bz2 (extracting bzip2 file)

Google Chrome 10.0.648.204 works good in RHEL6

Google Chrome 10.0.648.204 works good in RHEL6.

Steps to install Google Chrome to RHEL 6.

Step1:
Goto http://www.google.com/chrome/eula.html?platform=linux_fedora_i386 location

Step2: download the 32 bit .rpm (For Fedora/openSUSE) or 64 bit .rpm (For Fedora/openSUSE) with respect to your Operating System.

Step3: install the rpm by right clicking it.

Step4: Select the menu option as follows
Applications-> Internet -> Google Chorme.

Note: the rpm that is designed for Fedora and openSUSE works good for RHEL6 also.