Linux commands

Linux Commands
1. tar command examples
Create a new tar archive.	$ tar cvf archive_name.tar dirname/
Extract from an existing tar archive.	$ tar xvf archive_name.tar
View an existing tar archive.	$ tar tvf archive_name.tar
2. grep command examples
Search for a given string in a file (case in-sensitive search).	$ grep -i "the" demo_file
Print the matched line, along with the 3 lines after it.	$ grep -A 3 -i "example" demo_text
Search for a given string in all files recursively	$ grep -r "ramesh" *
3. find command examples
Find files using file-name ( case in-sensitve find)	# find -iname "MyCProgram.c"
Execute commands on files found by the find command	$ find -iname "MyCProgram.c" -exec md5sum {} \;
Find all empty files in home directory	# find ~ -empty
4. ssh command examples
Login to remote host	ssh -l jsmith remotehost.example.com
Debug ssh client	ssh -v -l jsmith remotehost.example.com
Display ssh client version	$ ssh –V OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003
5. sed command examples
When you copy a DOS file to Unix, you could find \r\n in the end of each line. This example converts the DOS file format to Unix file format using sed command.	$sed 's/.$//' filename
Print file content in reverse order	$ sed -n '1!G;h;$p' thegeekstuff.txt
Add line number for all non-empty-lines in a file	$ sed '/./=' thegeekstuff.txt | sed 'N; s/\n/ /'
6. awk command examples
Remove duplicate lines using awk	$ awk '!($0 in array) { array[$0]; print }' temp
Print all lines from /etc/passwd that has the same uid and gid	$awk -F ':' '$3==$4' passwd.txt
Print only specific field from a file.	$ awk '{print $2,$5;}' employee.txt
7. vim command examples
Go to the 143rd line of file	$ vim +143 filename.txt
Go to the first match of the specified	$ vim +/search-term filename.txt
Open the file in read only mode.	$ vim -R /etc/passwd
8. diff command examples
Ignore white space while comparing	# diff -w name_list.txt name_list_new.txt 2c2,3 < John Doe --- > John M Doe > Jason Bourne
9. sort command examples
Sort a file in ascending order	$ sort names.txt
Sort a file in descending order	$ sort -r names.txt
Sort passwd file by 3rd field.	$ sort -t: -k 3n /etc/passwd | more
10. export command examples
To view oracle related environment variables	$ export | grep ORACLE declare -x ORACLE_BASE="/u01/app/oracle" declare -x ORACLE_HOME="/u01/app/oracle/product/10.2.0" declare -x ORACLE_SID="med" declare -x ORACLE_TERM="xterm
To export an environment variable:	$ export ORACLE_HOME=/u01/app/oracle/product/10.2.0
11. xargs command examples
Copy all images to external hard-drive	# ls *.jpg | xargs -n1 -i cp {} /external-hard-drive/directory
Search all jpg images in the system and archive it.	# find / -name *.jpg -type f -print | xargs tar -cvzf images.tar.gz
Download all the URLs mentioned in the url-list.txt file	# cat url-list.txt | xargs wget –c
12. ls command examples
Display filesize in human readable format (e.g. KB, MB etc.,)	$ ls -lh -rw-r----- 1 ramesh team-dev 8.9M Jun 12 15:27 arch-linux.txt.gz
Order Files Based on Last Modified Time (In Reverse Order) Using ls -ltr	$ ls -ltr
Visual Classification of Files With Special Characters Using ls -F	$ ls -F
13. pwd command	pwd is Print working directory. What else can be said about the good old pwd who has been printing the current directory name for ages.
14. cd command examples
Use “cd -” to toggle between the last two directories	Use “shopt -s cdspell” to automatically correct mistyped directory names on cd
15. gzip command examples
To create a *.gz compressed file:	$ gzip test.txt
To uncompress a *.gz file:	$ gzip -d test.txt.gz
16. bzip2 command examples
To create a *.bz2 compressed file:	$ bzip2 test.txt
To uncompress a *.bz2 file:	bzip2 -d test.txt.bz2
Display compression ratio of the compressed file using gzip -l	$ gzip -l *.gz          compressed        uncompressed  ratio uncompressed_name               23709               97975  75.8% asp-patch-rpms.txt
17. unzip command examples
To extract a *.zip compressed file:	$ unzip test.zip
View the contents of *.zip file (Without unzipping it):	$ unzip -l jasper.zip Archive:  jasper.zip   Length     Date   Time    Name  --------    ----   ----    ----     40995  11-30-98 23:50   META-INF/MANIFEST.MF     32169  08-25-98 21:07   classes_     15964  08-25-98 21:07   classes_names     10542  08-25-98 21:07   classes_ncomp
18. shutdown command examples
Shutdown the system and turn the power off immediately.	# shutdown -h now
Shutdown the system after 10 minutes.	# shutdown -h +10
Reboot the system using shutdown command.	# shutdown -r now
Force the filesystem check during reboot.	# shutdown -Fr now
19. ftp command examples
Both ftp and secure ftp (sftp) has similar commands. To connect to a remote server and download multiple files, do the following.	$ ftp IP/hostname ftp> mget *.html
To view the file names located on the remote server before downloading, mls ftp command as shown below	ftp> mls *.html - /ftptest/features.html /ftptest/index.html /ftptest/othertools.html /ftptest/samplereport.html /ftptest/usage.html
20. crontab command examples
View crontab entry for a specific user	# crontab -u john -l
Schedule a cron job every 10 minutes.	*/10 * * * * /home/ramesh/check-disk-space
21. service command examples
Service command is used to run the system V init scripts. i.e Instead of calling the scripts located in the /etc/init.d/ directory with their full path, you can use the service command. Check the status of a service:	# service ssh status
Check the status of all the services.	service --status-all
Restart a service.	# service ssh restart
22. ps command examples
ps command is used to display information about the processes that are running in the system. While there are lot of arguments that could be passed to a ps command, following are some of the common ones. To view current running processes	$ ps -ef | more
To view current running processes in a tree structure. H option stands for process hierarchy.	$ ps -efH | more
23. free command examples
Typical free command output. The output is displayed in bytes.	$ free total       used       free     shared    buffers     cached Mem:       3566408    1580220    1986188          0     203988     902960 -/+ buffers/cache:     473272    3093136 Swap:      4000176          0    4000176
If you want to quickly check how many GB of RAM your system has use the -g option. -b option displays in bytes, -k in kilo bytes, -m in mega bytes.	$ free -g              total       used       free     shared    buffers     cached Mem:             3          1          1          0          0          0 -/+ buffers/cache:          0          2 Swap:            3          0          3
If you want to see a total memory (including the swap), use the -t switch, which will display a total line as shown below.	ramesh@ramesh-laptop:~$ free -t total       used       free     shared    buffers     cached Mem:       3566408    1592148    1974260          0     204260     912556 -/+ buffers/cache:     475332    3091076 Swap:      4000176          0    4000176 Total:     7566584    1592148    5974436
24. top command examples
top command displays the top processes in the system ( by default sorted by cpu usage ). To sort top output by any column, Press O (upper-case O) , which will display all the possible columns that you can sort by as shown below	Current Sort Field:  P  for window 1:Def Select sort field via field letter, type any other key to return   a: PID        = Process Id              v: nDRT       = Dirty Pages count   d: UID        = User Id                 y: WCHAN      = Sleeping in Function   e: USER       = User Name               z: Flags      = Task Flag
To displays only the processes that belong to a particular user use -u option. The following will show only the top processes that belongs to oracle user.	$ top -u oracle
25. df command examples
Displays the file system disk space usage. By default df -k displays output in bytes.	$ df -k Filesystem           1K-blocks      Used Available Use% Mounted on /dev/sda1             29530400   3233104  24797232  12% / /dev/sda2            120367992  50171596  64082060  44% /home
df -h displays output in human readable form. i.e size will be displayed in GB’s	ramesh@ramesh-laptop:~$ df -h Filesystem            Size  Used Avail Use% Mounted on /dev/sda1              29G  3.1G   24G  12% / /dev/sda2             115G   48G   62G  44% /home
26. kill command examples
Use kill command to terminate a process. First get the process id using ps -ef command, then use kill -9 to kill the running Linux process as shown below. You can also use killall, pkill, xkill to terminate a unix process.	$ ps -ef | grep vim ramesh    7243  7222  9 22:43 pts/2    00:00:00 vim $ kill -9 7243
27. rm command examples
Get confirmation before removing the file.	$ rm -i filename.txt
It is very useful while giving shell metacharacters in the file name argument. Print the filename and get confirmation before removing the file.	$ rm -i file*
Following example recursively removes all files and directories under the example directory. This also removes the example directory itself.	$ rm -r example
28. cp command examples
Copy file1 to file2 preserving the mode, ownership and timestamp.	$ cp -p file1 file2
Copy file1 to file2. if file2 exists prompt for confirmation before overwritting it.	$ cp -i file1 file2
29. mv command examples
Rename file1 to file2. if file2 exists prompt for confirmation before overwritting it. Note: mv -f is just the opposite, which will overwrite file2 without prompting.	$ mv -i file1 file2
mv -v will print what is happening during file rename, which is useful while specifying shell meta characters in the file name argument.	$ mv -v file1 file2
30. cat command examples
You can view multiple files at the same time. Following example prints the content of file1 followed by file2 to stdout.	$ cat file1 file2
While displaying the file, following cat -n command will prepend the line number to each line of the output.	$ cat -n /etc/logrotate.conf   1                     /var/log/btmp {                               2                       missingok     3                       monthly              4                       create 0660 root utmp     5                       rotate 1               6                   }
31. mount command examples
To mount a file system, you should first create a directory and mount it as shown below.	# mkdir /u01 # mount /dev/sdb1 /u01
You can also add this to the fstab for automatic mounting. i.e Anytime system is restarted, the filesystem will be mounted.	# mount /dev/sdb1 /u01/dev/sdb1 /u01 ext2 defaults 0 2
32. chmod command examples
chmod command is used to change the permissions for a file or directory. Give full access to user and group (i.e read, write and execute ) on a specific file.	$ chmod ug+rwx file.txt
Revoke all access for the group (i.e read, write and execute ) on a specific file.	$ chmod g-rwx file.txt
Apply the file permissions recursively to all the files in the sub-directories.	$ chmod -R ug+rwx file.txt
33. chown command examples
chown command is used to change the owner and group of a file. \ To change owner to oracle and group to db on a file. i.e Change both owner and group at the same time.	$ chown oracle:dba dbora.sh
Use -R to change the ownership recursively.	$ chown -R oracle:dba /home/oracle
34. passwd command examples
Change your password from command line using passwd. This will prompt for the old password followed by the new password.	$ passwd
Super user can use passwd command to reset others password. This will not prompt for current password of the user.	# passwd USERNAME
Remove password for a specific user. Root user can disable password for a specific user. Once the password is disabled, the user can login without entering the password.	# passwd -d USERNAME
35. mkdir command examples
Following example creates a directory called temp under your home directory.	$ mkdir ~/temp
Create nested directories using one mkdir command. If any of these directories exist already, it will not display any error. If any of these directories doesn’t exist, it will create them.	$ mkdir -p dir1/dir2/dir3/dir4/
36. ifconfig command examples
Use ifconfig command to view or configure a network interface on the Linux system.View all the interfaces along with status.	$ ifconfig -a
Start or stop a specific interface using up and down command as shown below.	$ ifconfig eth0 up $ ifconfig eth0 down
37. uname command examples
Uname command displays important information about the system such as — Kernel name, Host name, Kernel release number,Processor type, etc., Sample uname output from a Ubuntu laptop is shown below.	$ uname -a Linux john-laptop 2.6.32-24-generic #41-Ubuntu SMP Thu Aug 19 01:12:52 UTC 2010 i686 GNU/Linux
38. whereis command examples
When you want to find out where a specific Unix command exists (for example, where does ls command exists?), you can execute the following command.	$ whereis ls ls: /bin/ls /usr/share/man/man1/ls.1.gz/usr/share/man/man1p/ls.1p.gz
When you want to search an executable from a path other than the whereis default path, you can use -B option and give path as argument to it. This searches for the executable lsmk in the /tmp directory, and displays it, if it is available.	$ whereis -u -B /tmp -f lsmk lsmk: /tmp/lsmk
39. whatis command examples
Whatis command displays a single line description about a command.	$ whatis ls ls                                                (1)  - list directory contents $ whatis ifconfig ifconfig (8)         - configure a network interface
40. locate command examples
Using locate command you can quickly search for the location of a specific file (or group of files). Locate command uses the database created by updatedb. The example below shows all files in the system that contains the word crontab in it.	$ locate crontab /etc/anacrontab /etc/crontab /usr/bin/crontab /usr/share/doc/cron/examples/crontab2english.pl.gz /usr/share/man/man1/crontab.1.gz /usr/share/man/man5/anacrontab.5.gz /usr/share/man/man5/crontab.5.gz /usr/share/vim/vim72/syntax/crontab.vim
41. man command examples
Display the man page of a specific command.	$ man crontab
When a man page for a command is located under more than one section, you can view the man page for that command from a specific section as shown below.	$ man SECTION-NUMBER commandname
Following 8 sections are available in the man page. 1.General commands  2.System calls 3.C library functions	4.Special files (usually devices, those found in /dev) and drivers 5.File formats and conventions     6.Games and screensavers 7.Miscellaneous           8.System administration commands and daemons
For example, when you do whatis crontab, you’ll notice that crontab has two man pages (section 1 and section 5). To view section 5 of crontab man page, do the following.	$ whatis crontab crontab (1)          - maintain crontab files for individual users (V3) crontab (5)          - tables for driving cron $ man 5 crontab
42. tail command examples
Print the last 10 lines of a file by default.	$ tail filename.txt
Print N number of lines from the file named filename.txt	$ tail -n N filename.txt
View the content of the file in real time using tail -f. This is useful to view the log files, that keeps growing. The command can be terminated using CTRL-C.	$ tail -f log-file
43. less command examples
less is very efficient while viewing huge log files, as it doesn’t need to load the full file while oping.	$ less huge-log-file.log
One you open a file using less command, following two keys are very helpful.	CTRL+F – forward one window  CTRL+B – backward one window
44. su command examples
Switch to a different user account using su command. Super user can switch to any other user without entering their password.	$ su - USERNAME
Execute a single command from a different account name. In the following example, john can execute the ls command as raj username. Once the command is executed, it will come back to john’s account.	[john@dev-server]$ su - raj -c 'ls' [john@dev-server]$
Login to a specified user account, and execute the specified shell instead of the default shell.	$ su -s 'SHELLNAME' USERNAME
45. mysql command examples
To connect to a remote mysql database. This will prompt for a password.	$ mysql -u root -p -h 192.168.1.2
To connect to a local mysql database.	$ mysql -u root -p
46. yum command examples
To install apache using yum.	$ yum install httpd
To upgrade apache using yum.	$ yum update httpd
To uninstall/remove apache using yum	$ yum remove httpd
47. rpm command examples
To install apache using rpm.	# rpm -ivh httpd-2.2.3-22.0.1.el5.i386.rpm
To upgrade apache using rpm.	# rpm -uvh httpd-2.2.3-22.0.1.el5.i386.rpm
To uninstall/remove apache using rpm.	# rpm -ev httpd
48. ping command examples
Ping a remote host by sending only 5 packets.	$ ping -c 5 gmail.com
49. date command examples
Set the system date:	# date -s "01/31/2010 23:59:53"
Once you’ve changed the system date, you should syncronize the hardware clock with the system date as shown below.	# hwclock –systohc # hwclock --systohc –utc
50. wget command examples
$ wget http://prdownloads.sourceforge.net/sourceforge/nagios/nagios-3.2.1.tar.gz	The quick and effective method to download software, music, video from internet is using wget command.
$ wget -O taglist.zip http://www.vim.org/scripts/download_script.php?src_id=7701	Download and store it with a different name.

JMETER Tutorial

JMETER by neovik82

Web Service : Perf Test

To show the how to performance test of any webservice which is taking some input and returning  output in response , i am using Yahoo Weather service for Demo purpose .

 http://weather.yahooapis.com/forecastrss?w=2442047&u=c

Input 1 :  W = 2442047 >>> Location Id 

Input 2 : u = c >> Celsius( Temp ) 

If User direct Request the  above url then it would return response like :

Yahoo! Weather - Los Angeles, CA
Yahoo! Weather for Los Angeles, CA
Conditions for Los Angeles, CA at 6:47 pm PSTFriday, December 14, 2012 8:17 AM

Current Conditions:

Fair, 12 C


Forecast:

Thu - Partly Cloudy. High: 16 Low: 8

Fri - Partly Cloudy. High: 14 Low: 9



Full Forecast at Yahoo! Weather


(provided by The Weather Channel)


To Automate the above requirement  follow the Step below :

1. Add the Thread Group >>Add the Http Sampler   and add the Server name/ IP = weather.yahooapis.com  in Path  put the forecastrss?w=2442047&u=c   
2. Now  w=2442047 and u =c  need to be parametrized  replace them with ${location}  and ${format} 
   

  

3.Add Csv data set config provide the File name of csv file and Variables location,format

 4.Add Test data in Csv File 

 5. To verify the Web service is working or not  Add the Assertion >>
      In this case you can add the Location name in text response Pattern and  parametrize the  assertion text . I don't know the  all location so i am  just adding the Response Code in Assertion