Comparing two test files and printing out the values that do not match Post: 302726275

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

reading two files, comparing, printing when unmatched value is seen

Hello, I have two files: file1 1 2 3 4 5 file2 "a","b",,,,,"c","1",..... "s","d",,,,,"s","1",..... "a","c",,,,,"d","1",.... "f","v",,,,,,"f","2",..... etc I have to read "1" from file1 and grab all records in file2 (say column 6 in file2 is "1") until the column changes its value (...

2. UNIX for Dummies Questions & Answers

Comparing two files and count number of lines that match

Hello all, I always found help for my problems using the search option, but this time my request is too specific. I have two files that I want to compare. File1 is the index and File2 contains the data: File1: chr1 protein_coding exon 500 600 . + . gene_id "20532";...

3. UNIX for Dummies Questions & Answers

Comparing a batch of files to a test file

Hi I am writing a script to run a loop through a directory and run a diff on each file against my test file. I then want to time how long each file to process (not sure how time works), as well as how long all the files took as a whole to process. Here is my code #!/bin/bash #Old...

4. Shell Programming and Scripting

Comparing two files and printing 2nd column if match found

Hi guys, I'm rather new at using UNIX based systems, and when it comes to scripting etc I'm even newer. I have two files which i need to compare. file1: (some random ID's) 451245 451288 136588 784522 file2: (random ID's + e-mail assigned to ID) 123888 xc@xc.com 451245 ...

5. UNIX for Dummies Questions & Answers

Comparing two text files by a column and printing values that do not match

I have two text files where the first three columns are exactly the same. I want to compare the fourth column of the text files and if the values are different, print that row into a new output file. How do I go about doing that? File 1: 100 rs3794811 0.01 0.3434 100 rs8066551 0.01...

6. Shell Programming and Scripting

Comparing the values of two files

Hi Am trying to compare the values of two files.. One is a big file that has many values and the other is a small file.. The big file has all values present in small file.. # cat SmallFile 4456602 22347881 7471282 15859891 8257690 21954701 7078068 18219229 2883826 6094959 100000 ...

7. Shell Programming and Scripting

Awk: Comparing arguments with in line values of file and printing the result

I need to develop a script where I will take two date arguments as parameter date1 and date2 which will in format YYYYMM. Below is the input file say sample.txt. sample.txt will have certain blocks starting with P1. Each block will have a value 118,1:TIMESTAMP. I need to compare the...

8. Shell Programming and Scripting

Comparing same column from two files, printing whole row with matching values

First I'd like to apologize if I opened a thread which is already open somewhere. I did a bit of searching but could quite find what I was looking for, so I will try to explaing what I need. I'm writing a script on our server, got to a point where I have two files with results. Example: File1...

9. Shell Programming and Scripting

Comparing two one-line files and selecting what does not match

I have two files. One is consisting of one line, with data separated by spaces and each number appearing only once. The other is consisting of one column and multiple lines which can have some numbers appearing more than once. It looks something like this: file 1: 20 700 15 30 file2: 10...

10. Shell Programming and Scripting

Comparing two columns in two files and printing a third based on a match

Hello all, First post here. I did not notice a previous post to help me down the right path. I am looking to compare a column in a CSV file against another file (which is not a column match one for one) but more or less when a match is made, I would like to append a third column that contains a...

LEARN ABOUT REDHAT

pnmpsnr

pnmpsnr(1)						      General Commands Manual							pnmpsnr(1)

NAME

       pnmpsnr - compute the difference between two images (the PSNR)

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)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

reading two files, comparing, printing when unmatched value is seen

Discussion started by: i.scientist

2. UNIX for Dummies Questions & Answers

Comparing two files and count number of lines that match

Discussion started by: DerSeb

3. UNIX for Dummies Questions & Answers

Comparing a batch of files to a test file

Discussion started by: ladyAnne

4. Shell Programming and Scripting

Comparing two files and printing 2nd column if match found

Discussion started by: spirm8