Share N Gain

“Improve Defect Detection with Hypothesis Based Testing (HBT)”

2011-06-20T13:06:00.001+05:30

WEBINAR LINK : http://vimeo.com/24408450

bad interpreter: No such file or directory,

2011-03-25T17:33:00.001+05:30

#./file.sh -bash: ./file.sh: /bin/bash^M: bad interpreter: No such file or directory Things to consider or check 1. If you open up the script, it will probably have this as the first line: #!/bin/bash That line tells the system that /bin/bash should be used to interpret the commands within the file. /bin/bash is the absolute path to the interpreter. It sounds as though you do not have the bash shell installed. If that is the case, then you'll need to install bash, or look for the same (or similar script) written for a shell/language you have installed on your system. 2. Try bash file.sh from the # prompt If it gives some error like : command not found line 2: : command not found line 9: : command not found line 15: : command not found line 18: : command not found line 21: : command not found line 24: then do a dos2unix file.sh and then run the script, ./file.sh to convert the data that we upload before, that does not seems to work properly, to Linux format. Note : All I mentioned above is some work around. Hope it will be working for your problem also.

Quick reference: To determine the system disk space usage

2011-03-22T12:43:00.000+05:30

df - report file system disk space usage

Eg: df -h


Filesystem	Size	Used	Avail	Use%	Mounted on
/dev/mapper/VolGroup00-LogVol00	7.2G	6.4G	474M	94%	/
/dev/mapper/VolGroup00-LogVol00
/dev/hda1	99M	12M	82M	13%	/boot
shared	75G	30G	45G	41%	/mnt/shared

Quick reference: Uninstalling the tar zip file

2011-03-22T12:17:00.000+05:30

tar -zxvf test123.tar.gz

z -- unzip

x -- extract the file

v -- verbose

f -- forcefully done

System Monitoring

2010-10-15T14:21:00.003+05:30

Linux come with many built in commands to monitoring the system. You can check your system performance with these tools from cpu load, memory usage, network traffic, and etc. From this monitoring tools you can check what is the cause the server not on its normal performance.

Below are the tools to check your Linux system health:

1. top

top (table of process) command will show you a dynamic real-time view of a running system i.e. actual process activity. It update every 5 seconds.

top hot keys:

t Displays summary information off and on.

m Displays memory information off and on.

A Sorts the display by top consumers of various system resources. Useful for quick identification of performance-hungry tasks on a system.

f Enters an interactive configuration screen for top. Helpful for setting up top for a specific task.

o Enables you to interactively select the ordering within top.

r Issues renice command.

k Issues kill command.

z Turn on or off color/mono

2. netstat

netstat command will show the network statistic. You can find out total established connections, closing connection, SYN and FIN bits and much more. You can also display summary statistics for each protocol using netstat.

3. vmstat

vmstat is a command for monitorig system activity, hardware and system information.

To show processes, memory, paging, block IO, traps, and cpu activity reports:

vmstat

sample output:

procs ------memory---------- --swap-- ---io-- --system-- ----cpu----

r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs    us sy id wa
3  0      0 2485120 621952 2415368  0    0     0     0    0       1 32  0 68  0

4. w

w is a command to show the real time log activity for logged in user.

command:

w [username]

sample:

w ivan

5. ps

ps is a command to display the running processes.

To show all processes:

ps -A
ps ax
ps axu

Show long format output:

ps -Al

Show threads:

ps -AlFH

See processes run by user:

ps -U [username] -u [username] u

Show the top 10 memory consuming process:

ps -auxf | sort -nr -k 4 | head -10

Show the top 10 cpu consuming process:

ps -auxf | sort -nr -k 3 | head -10

6. free

free is a command to show your the memory report. It will show the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel.

Usage:

free

7. iostat

iostat is a command to show cpu statistics and input/output statistics for devices, partitions and network filesystems (NFS).

Usage:

iostat

8. mpstat

mpstat is a command to show you multiprocessor usage.

To average CPU utilization per processor:

mpstat -P ALL

9. pmap

pmap is acommand to show memory map of a process.

Usage:

pmap -d PID

Sample to show memory information for process id 14243:

pmap -d 14243

10. iptraf

iptraf is a command to show real-time network statistics with interactive colorful ui text based. What can iptraf provide:

* Network traffic statistics by TCP connection

* IP traffic statistics by network interface

* Network traffic statistics by protocol

* Network traffic statistics by TCP/UDP port and by packet size

* Network traffic statistics by Layer2 address

How can I determine if my computer/operating system is 64-bit?

2010-06-18T15:20:00.010+05:30

Author : Pete Huckelba, StataCorp

If you are using Windows Vista, click Start → Control Panel ->System and Maintenance ->System.

The System type:line will give you the Operating System type:

If you are using Windows XP, click Start → Run and typedxdiag. If a Windows dialog box is displayed asking if you want to verify your drivers, you can safely click No and continue. When the program has finished loading, you should see something similar to one of the following images:

The Operating System line, refers to Windows x64 or 64-bit edition. The last image above specifies the processorItanium, which is a 64-bit processor.

Mac

Select About this Mac from theApple menu. The text belowMac OS X will give the operating system version, and theProcessor line will give you the processor type.

Mac OS X 10.5 (or greater) is a 64-bit operating system. Intel Core 2 Duo, Intel Xeon, and PowerPC G5 are 64-bit processors. However, 64-bit Stata for Mac is available only for 64-bit Intel-based Macs.

All currently shipping Macs have a 64-bit processor and a 64-bit operating system.

Unix (IBM-AIX, Sun Solaris)

IBM-AIX

The getconf command will return the configuration of your machine. Since you are looking only for the kernel parameters, you should type

[cph@anna ~]$ getconf -a | grep KERN

KERNEL_BITMODE: 64

If that fails or does not return a result, try the file command.

[cph@anna ~]$ file /usr/lib/boot/unix*

/usr/lib/boot/unix: 64-bit XCOFF executable or object module not stripped

/usr/lib/boot/unix_64: 64-bit XCOFF executable or object module not stripped

/usr/lib/boot/unix_mp: executable (RISC System/6000) or object module not stripped

/usr/lib/boot/unix_up: executable (RISC System/6000) or object module not stripped

[cph@ozona ~]$ file /usr/lib/boot/unix*

/usr/lib/boot/unix: symbolic link to /usr/lib/boot/unix_up.

/usr/lib/boot/unix_kdb: executable (RISC System/6000) or object module not stripped

/usr/lib/boot/unix_up: executable (RISC System/6000) or object module not stripped

We can see that 'anna' is a 64-bit capable platform, and 'ozona' is only 32-bit.

Sun Solaris

Sun's platforms transitioned to 64-bit over a period of time, making identifying the platform for 64-bit compliance tricky. Sun has stated:

Sun has implemented its 64-bit operating system in phases. The Solaris 2.5 Operating Environment provided support for increased precision with 64-bit math and also included support for 64-bit asynchronous I/O. The Solaris 2.6 Operating Environment added support for large datasets with large (1 Terabyte) filesystems while allowing co-existence of 32-bit and 64-bit files. Beginning with the Solaris 7 Operating Environment, Sun introduced support for large virtual address spaces with a full 64-bit operating system. Sun began shipping 64-bit hardware in 1995. By phasing in operating system support for 64-bits Sun has provided 64-bit features as the market has demanded them while guaranteeing compatibility for existing 32-bit applications.

To determine what kind of binaries your Solaris machine can run, try the following:

eden:/home/cph: isainfo -v

64-bit sparcv9 applications

32-bit sparc applications

You can see that this Solaris machine is capable of running 32-bit as well as 64-bit applications. If isainfo fails, running a 64-bit application on your Sun will generally not be possible, unless of course isainfo is not in your path or has not been installed. You can also use the uname command to glean more information:

eden:/home/cph: uname -a

SunOS eden 5.8 Generic_108528-05 sun4u sparc SUNW,Ultra-5_10

lagrange:/usr/users/cph: uname -a

SunOS lagrange 5.5.1 Generic_103640-29 sun4u sparc SUNW,Ultra-1

SunOS/Solaris versions map to the following:

SunOS	SOLARIS
5.3	2.3
5.4	2.4
5.5	2.5
5.5.1	2.5.1
5.6	2.6
5.7 or greater is 64-bit compliant	2.7 or greater is 64-bit compliant

While all UltraSparc processors are capable of 64-bit computing, the OS release level may be the limiting factor. In the above excerpt, 'eden' (SunOS 5.8) is a fully compliant 64-bit platform, and 'lagrange' (SunOS 5.5.1) is a 64-bit UltraSparc limited to 32-bit computing.

Linux

Linux users should type the uname command. Depending on the platform, you may see

[cph@gaylord ~]$ uname -a
Linux gaylord.stata.com 2.6.11-1.27_FC3 #1 Tue May 17 20:24:57 EDT 2005 x86_64 x86_64 x86_64 GNU/Linux

[cph@caddo ~]$ uname -a
Linux caddo.stata.com 2.6.9-5.0.5.EL #1 SMP Fri Apr 8 14:20:58 EDT 2005 ia64 ia64 ia64 GNU/Linux

[cph@tango ~]$ uname -a
Linux tango.stata.com 2.6.10-1.771_FC2smp #1 SMP Mon Mar 28 01:10:51 EST 2005 i686 i686 i386 GNU/Linux

In the above listing, 'gaylord' (x86_64 GNU/Linux) and 'caddo' (ia64 GNU/Linux) are 64-bit compliant. 'tango' (i386 GNU/Linux) is only a 32-bit platform.

Courtesy : http://www.stata.com/support/faqs/win/64bit.html

REFERO -1

2009-08-17T18:16:00.004+05:30

1. How do I replace every TAB character in a file with a comma?

----http://www.devdaily.com/perl/edu/qanda/plqa00022.shtml---

2. Re: Perl: Requires explicit package name

The "my" keyword. "use strict" requires that you use my for all local variables, or explicitely qualify all globals.

----http://www.vbforums.com/showthread.php?t=431049---

---http://perldoc.perl.org/functions/open.html---

4. Find and replace all occurances of one string with another

---http://wiki.hypexr.org/wikka.php?wakka=PerlFindReplace---

---http://www.regular-expressions.info/perl.html---

6. Sample Chapter 8: File Contents

---http://oreilly.com/catalog/cookbook/chapter/ch08.html---

7. Designing a Search Engine By Pete Sergeant

---http://www.perl.com/lpt/a/530---

8. How to return a line number from a text file in perl?

---http://www.webmasterworld.com/perl/3049344.htm---

9. How do I dynamically create a hash table?

---http://www.perlmonks.org/?node_id=38743---