10-17-2008
Google for "rosetta stone unix", that will tell you most things.
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi,
I recently joined this forum and new to UNIX.
Is there any difference between UNIX operating system and UNIX open server? Please explain. (1 Reply)
Discussion started by: Manjit
1 Replies
2. UNIX for Dummies Questions & Answers
Ok, I'm confused.
Can someone answer these (stupid) questions please for me?
1. What is the difference between unix and linux?
2. Is FreeBSD a unix distribution?
3. If not, then what is Unix? I actually gone to Unix.com because I thought this is it's official website where I could download... (1 Reply)
Discussion started by: RellioN
1 Replies
3. UNIX for Dummies Questions & Answers
OK, I've used various versions of UNIX(Solaris, HPUX, etc..) over the years. Now the organization I work for is leaning towards more Linux based systems(Redhat, Suse, etc..)
I do see differences in in comands and how to accomplish basic adminstration, but nothing mind blowing.
So, what is it... (5 Replies)
Discussion started by: pbonilla
5 Replies
4. UNIX for Dummies Questions & Answers
I need the get the difference between 2 files and the result, I need to output it to an other file
file1
1
1
2
file2
1
1
2
3
Result....File3=3
used diff file1 file2 > file3 ( not working as expected)..Exact requirement..I have 2 flatfiles to compare and load only the difference in a... (17 Replies)
Discussion started by: win4luv
17 Replies
5. UNIX for Dummies Questions & Answers
Hi all,
can anyone share any URl or link which is about the main 20 advantages and features of unix over windows i mean i need camparison matrix between windows and any flavour of unix. thanks a lot in advance for sharing.
Best Regards (4 Replies)
Discussion started by: younusdba
4 Replies
6. Shell Programming and Scripting
Hi,
I am having files in the below format
$ cat a.txt
1, abc, 1234
2, bcd, 2345
$ cat b.txt
1, bcd, 2345
2, cde, 3456
and I want to display only what is not exists in a.txt through UNIX script.
like 2, cde, 3456
Please advice me. (1 Reply)
Discussion started by: Alex_Smith
1 Replies
7. Shell Programming and Scripting
I have 2 variables
MTIME="Jan_2_2012_23:55:49"
SCH_TIME="Jan_03_2012_00:32:28"
I want to find the time taken (in seconds) between MTIME and SCH_TIME.
Is there any way by which this can be done in Unix Shell Script? (4 Replies)
Discussion started by: ankitncr
4 Replies
8. UNIX for Dummies Questions & Answers
Hi I am new to linux
I have dout waht is the difference between UNIX and LINUX
Is there any soft for insatallation for UNIX OS
Thanks (0 Replies)
Discussion started by: sanjaya
0 Replies
9. UNIX for Dummies Questions & Answers
hi experts please tell me the real difference between unix and linux at kernel structure (1 Reply)
Discussion started by: linurag
1 Replies
LEARN ABOUT MINIX
pnmpsnr
pnmpsnr(1) General Commands Manual pnmpsnr(1)
NAME
pnmpsnr - compute the difference between two portable anymaps
SYNOPSIS
pnmpsnr [pnmfile1] [pnmfile2]
DESCRIPTION
Reads two PBM, PGM, or PPM files, or PAM equivalents, as input. Prints the peak signal-to-noise ratio (PSNR) difference between the two
images. This metric is typically used in image compression papers to rate the distortion between original and decoded image.
If the inputs are PBM or PGM, pnmpsnr prints the PSNR of the luminance only. Otherwise, it prints the separate PSNRs of the luminance, and
chrominance (Cb and Cr) components of the colors.
The PSNR of a given component is the ratio of the mean square difference of the component for the two images to the maximum mean square
difference that can exist betwee any two images. It is expressed as a decibel value.
The mean square difference of a component for two images is the mean square difference of the component value, comparing each pixel with
the pixel in the same position of the other image. For the purposes of this computation, components are normalized to the scale [0..1].
The maximum mean square difference is identically 1.
So the higher the PSNR, the closer the images are. A luminance PSNR of 20 means the mean square difference of the luminances of the pixels
is 100 times less than the maximum possible difference, i.e. 0.01.
SEE ALSO
pnm(5)
04 March 2001 pnmpsnr(1)