sources: CommScope via BGR
Friday, June 20, 2014
The Evolution of G
sources: CommScope via BGR
Posted by WAQAS at 5:34 AM 0 comments
Monday, September 17, 2012
Sunday, April 15, 2012
Useful Unix OS Commands
I have listed some useful unix operating system level commands, if you are new and looking for the tutorials and stuff hope these commands will help in performing difference operations. Cheers and Good Luck!
grep
----
used to find a specific word
head
----
this command is used to read starting lines of a file
tail
----
this command is used to read the last lines of a file
nohup
-----
Command is used to run processes in background
gzip
----
this command zip files in unix
gzcat
-----
this command is used to view the zipped file
for
---
we use loops in a console or shell sctipts to execute any command more than once
cp
--
copy command
mv
--
move command
rm
--
it deletes file
rmdir
-----
remove directory
mkdir
------
creates directory
awk
-----
this command is string manupulation, and is major use is to print columns from a file and other sources
sed
----
stread line editor is also a string manupulation command used for manupulation data as per requirement
>
---
this is very important symbol which redirects an output to a file rather than displaying on consoele
>>
---
this redirection sign append data content in a file that alresdy contain data
find
-----
to locate or find a command from various directories or same directory we use this command
cat
----
to read only a file we use this command
ps -ef
-------
this command is used to find the running processes on the server
bash
-----
shell mostly used for shell scripting and on console as well
chmod
--------
to change the permisions
crontab
--------
this is a scheduler in unix where we schedule our jobs for execution on specified time, read it from internet also
Crontab syntax :
A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval.
* * * * * command to be executed
- - - - -
| | | | |
| | | | +----- day of week (0 - 6) (Sunday=0)
| | | |
| | | +------- month (1 - 12)
| | |
| | +--------- day of month (1 - 31)
| |
| +----------- hour (0 - 23)
|
+------------- min (0 - 59)
df
---
shows free disk space
du
---
shows disk usage
prstat -a
----------
shows systems current status
vi
---
editor used in unix to create/update files
--
Author:
Waqas Rafi
grep
----
used to find a specific word
head
----
this command is used to read starting lines of a file
tail
----
this command is used to read the last lines of a file
nohup
-----
Command is used to run processes in background
gzip
----
this command zip files in unix
gzcat
-----
this command is used to view the zipped file
for
---
we use loops in a console or shell sctipts to execute any command more than once
cp
--
copy command
mv
--
move command
rm
--
it deletes file
rmdir
-----
remove directory
mkdir
------
creates directory
awk
-----
this command is string manupulation, and is major use is to print columns from a file and other sources
sed
----
stread line editor is also a string manupulation command used for manupulation data as per requirement
>
---
this is very important symbol which redirects an output to a file rather than displaying on consoele
>>
---
this redirection sign append data content in a file that alresdy contain data
find
-----
to locate or find a command from various directories or same directory we use this command
cat
----
to read only a file we use this command
ps -ef
-------
this command is used to find the running processes on the server
bash
-----
shell mostly used for shell scripting and on console as well
chmod
--------
to change the permisions
crontab
--------
this is a scheduler in unix where we schedule our jobs for execution on specified time, read it from internet also
Crontab syntax :
A crontab file has five fields for specifying day , date and time followed by the command to be run at that interval.
* * * * * command to be executed
- - - - -
| | | | |
| | | | +----- day of week (0 - 6) (Sunday=0)
| | | |
| | | +------- month (1 - 12)
| | |
| | +--------- day of month (1 - 31)
| |
| +----------- hour (0 - 23)
|
+------------- min (0 - 59)
df
---
shows free disk space
du
---
shows disk usage
prstat -a
----------
shows systems current status
vi
---
editor used in unix to create/update files
--
Author:
Waqas Rafi
Posted by WAQAS at 11:23 PM 0 comments
Tuesday, March 13, 2012
Generate Keys for copying files in Unix/Linux
In order to copy files to a remote machine without being asked for a password we can perform this task to complete this process.
Generate keys on a source system at (/home/user/.ssh/) and place its public key on the destination system on (home/user/.ssh/) with a file named authorized_keys that will be used while file transfer without asking for a password.
Commands
1. Go to Source Machine /home/user/.ssh/
2. Give command
>ssh-keygen -t rsa
i- it will ask u for a file name,
ii- it will ask for a paraphrase
iii- it will ask for a paraphrase again
or just enter thrice to create public and private keys.
3. Now copy the content of public key with extension .pub into the destination machine by creating a file name authorized_keys in directory /home/user/.ssh/
4. Now secure copy a file to the remote machine by using scp command and u will not prompt with password any more.
scp file_to_be_copied.txt user@ip-address:/destination_path_on_remote machine
Good Luck!
Author:
Waqas Rafi
Generate keys on a source system at (/home/user/.ssh/) and place its public key on the destination system on (home/user/.ssh/) with a file named authorized_keys that will be used while file transfer without asking for a password.
Commands
1. Go to Source Machine /home/user/.ssh/
2. Give command
>ssh-keygen -t rsa
i- it will ask u for a file name,
ii- it will ask for a paraphrase
iii- it will ask for a paraphrase again
or just enter thrice to create public and private keys.
3. Now copy the content of public key with extension .pub into the destination machine by creating a file name authorized_keys in directory /home/user/.ssh/
4. Now secure copy a file to the remote machine by using scp command and u will not prompt with password any more.
scp file_to_be_copied.txt user@ip-address:/destination_path_on_remote machine
Good Luck!
Author:
Waqas Rafi
Posted by WAQAS at 5:22 AM 0 comments
Labels: Unix
Wednesday, October 5, 2011
Steve Jobs Died 'Peacefully,' Family Says
The family of former Apple chief executive
Steve Jobs said that he died "peacefully" on Wednesday, surrounded by
his family. A memorial Web site will be posted.
Jobs passed away at the age of 56. Jobs is survived by his wife Laurene and two children, as well as a daughter from a previous relationship.
On August 24, Jobs stepped down,
stating that he could no longer meet his duties and expectations as
Apple's chief executive. Jobs was diagnosed with and treated for a rare
type of pancreatic cancer in 2004, but he said the 2009 absence was not a
resurgence of that cancer. He took a medical leave of absence in January.
In a statement, Jobs' family said he died peacefully.
"Steve died peacefully today surrounded by his family.
"In his public life, Steve was known as a visionary; in his private
life, he cherished his family. We are thankful to the many people who
have shared their wishes and prayers during the last year of Steve's
illness; a website will be provided for those who wish to offer tributes
and memories.
"We are grateful for the support and kindness of those who share our
feelings for Steve. We know many of you will mourn with us, and we ask
that you respect our privacy during our time of grief."
Numerous members of the tech world chimed in with their own tributes,
and Twitter was filled with condolences attached to the #RIPSteveJobs
hashtag. Online, mourners began leaving notes on Facebook tribute pages
as well as the Steve Jobs Day Facebook page.
Apple's board also released its own statement.
"Steve's brilliance, passion and energy were the source of countless innovations that enrich and improve all of our lives. The world is immeasurably better because of Steve.
"His greatest love was for his wife, Laurene, and his family. Our hearts go out to them and to all who were touched by his extraordinary gifts.
John Lasseter, chief creative officer and Ed Catmull, president of Walt Disney and Pixar Animation Studios, released their own joint statement. Jobs was chief executive at Pixar, the digital anaimation house that gave the world Cars, The Incredibles and Toy Story, before it was acquired by Disney in 2006.
"Steve Jobs was an extraordinary visionary, our very dear friend and the guiding light of the Pixar family," Lasseter and Catmull said. "He saw the potential of what Pixar could be before the rest of us, and beyond what anyone ever imagined. Steve took a chance on us and believed in our crazy dream of making computer animated films; the one thing he always said was to simply 'make it great.' He is why Pixar turned out the way we did and his strength, integrity and love of life has made us all better people. He will forever be a part of Pixar's DNA. Our hearts go out to his wife Laurene and their children during this incredibly difficult time."
Source: http://www.pcmag.com/article2/0,2817,2394212,00.asp#fbid=NwMGyfuEQvV
Posted by WAQAS at 11:13 PM 0 comments
Wednesday, July 13, 2011
Kill multiple processes using awk command
If you wish to kill multiple instances manually executed in background or the running processes of crontab then you can kill them all without taking the headache of selecting process id of each process and giving command "kill -9 process id", so this command can do magic for you
ps -ef | grep "username or process name" | grep -v grep | awk '{ print $2 }' | xargs kill -9
This command will first check running process with specific username or process name than "grep -v grep" will exclude the row which contain the word grep in it after that awk command prints the second column of process id's and "xargs kill -9" will kill all the returned process id's associated with it.
Author:
Waqas Rafi
Posted by WAQAS at 12:05 AM 1 comments
Labels: Unix
Subscribe to:
Posts (Atom)