Basic Commands (Unix) General Unix Commands :

Basic Commands (Unix)  General Unix Commands :

Command Example Description
1.   ls ls
ls -alF Lists files in current directory
List in long format
2.   cd cd tempdir
d ..
d ~dhyatt/web-docs Change directory to tempdir
ove back one directory
ove into dhyatt's web-docs directory
3.   mkdir mkdir graphics Make a directory called graphics
4. rmdir rmdir emptydir Remove directory (must be empty)
5.   cp cp file1 web-docs
cp file1 file1.bak Copy file into directory
Make backup of file1
6.     rm rm file1.bak
rm *.tmp Remove or delete file
Remove all file
7.   mv mv old.html new.html Move or rename files
8.     more more index.html Look at file, one page at a time
9.   lpr lpr index.html Send file to printer
10. man man ls Online manual (help) about command

Sharing directories with NFS in Solaris 10

Sharing directories with NFS in Solaris 10

To share a directory in Solaria, the home of the users, or a directory with binaries.
With svcs the service status can be checked, so lets check the status of the nfs server:

#svcs network/nfs/server

STATE STIME FMRI
offline 2:19:03 svc:/network/nfs/server:default
The service is offline, so you have to enable it and start it, lets do it:

#svcadm enable -r network/nfs/server

#svcadm enable -s network/nfs/server

#svcadm restart network/nfs/server

Now it is started:

#svcs network/nfs/server

STATE STIME FMRI
online 2:29:51 svc:/network/nfs/server:default
Now, to share a directory, edit /etc/dfs/dfstab and add:
share -F nfs /export/test
Save the file and execute:

#shareall -F nfs
Now check the shares:

#share
- /export/test rw "" 

Step by Step creating partition in Red Hat Linux / How to create partition in Red Hat Linux environment ?

Create a 500MB new partition and should be mounted under /mountpoint as ext4 type.

Answer:

# fdisk -cul (for viewing the partition information)

# fdisk -cu /dev/vda

# m (for help)

# n (for new partition)

# e (for all spaces extended partition)

# Not p (because primary partition limit only 4)

# 3 (for partition number)

# Enter (for first cylinder)

# Enter (for last cylinder)

# w (for save)

# reboot (for rebooting the machine)

After rebooting the machine:    

# fdisk -cul (for viewing partition)

# fdisk -cu /dev/vda

# m (for help)

# n (for new partition)

# l (for logical partition)

# Enter (for first cylinder)

# +500M Enter (for last cylinder)

# w (for save)

# reboot (for rebooting the machine)

After rebooting the machine:    

# fdisk -cul (for viewing partition)

# mkfs.ext4 /dev/vda5

# mkdir -p /mountpoint (p for focely created one directory in another)

# mount /dev/vda5 /coss/new/

# df -h (for mounting information)

# vim /etc/fstab (for permanently mount)

  /dev/vda5         /mountpoint          ext4                       defaults               0 0

# mount -a

# df -h

difference between data and metadata

Metadata describes about data. It is ‘data about data’. It has information about how and when, by whom a certain data was collected and the data format. It is essential to understand information that is stored in data warehouses and xml-based web applications.

So, "meta" simply means "about the thing you're talking about". So metadata is data about the data. Data is information. Metadeta is information about the information. For example, you might have a chart that lists the population of each US State. You might then have details about that chart - what color it is, if it's a bar chart or a pie chart, what symbols are on it, etc. That would be metadata. 

Data dictionary is a file which consists of the basic definitions of a database. It contains the list of files that are available in the database, number of records in each file, and the information about the fields.

So,A data is individual facts, statistics, or items of information.Metadata describes other data. It provides information about a certain item's content. For example, an image may include metadata that describes how large the picture is, the color depth, the image resolution, when the image was created, and other data. A text document's metadata may contain information about how long the document is, who the author is, when the document was written, and a short summary of the document. 

Changing the Hostname (RedHat)

Changing the Hostname (RedHat)

hostname command by default will display the current hostname 

for temporarily change the hostname you may type :- 

# hostname xxx.yyyy.com                                                 

And it will be gone after reboot so , for permanently change it ,

RedHat based system use the file /etc/sysconfig/network to read the saved hostname at system boot.

# vi /etc/sysconfig/network 


NETWORKING=yes
HOSTNAME=xxx.yyyy.com


And after that reboot your system and hostname will be changed .








You may also check this links :- details provided with snapshot :- )
http://computernetworkingnotes.com/network-administration/network-setup-in-rhce6.html

how to break root pasword of linus with snapshot?

How to break root pasword of linus with snapshot?  Or,

How to set new password of root without log into the root user?

Step 01 : Press any button or space bar in the window . And Press "a" to modify.

Step 3: After that this window will come . after rhgb quiet >> write "1" . it will give you access to single user interface. 

Step 3 : After that when this window come . Write "passwd" and it will prompt to set the password . Now set the new password as your wish ! and reboot ! And enjoy :- )

Any Question ask me without any hesitation ?

ALL ABout Linux RedHut for EX300 (Will be continue updateing .. )

(1) Configure Host Name
# vim /etc/sysconfig/network

(2) Configure IP Address, Gateway and DNS.
Validate these profiles:
a) Check gateway: # vim / etc / sysconfig / network
b) Check Host Name: # vim /etc/hosts
c) Check DNS: # vim /etc/resolv.conf
d) Check Gateway: # vim /etc/sysconfig/network-scripts/ifcfg-eth0


Question 1
In accordance with the following requirements to deploy ssh login service:
(1) Make  example.com which can remote login your systems.
(2) Where, users of remote.test can not use ssh login to your machine.

[root@server1 ~]# grep sshd /etc/hosts.allow
sshd:.example.com
[root@server1 ~]# grep sshd /etc/hosts.deny
sshd:.remote.test

Note:
tcp_wrappers has two configuration files and their priority level is
/etc/hosts.allow->/etc/hosts.deny