backup types Post: 42463

8 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

servers types

dear sir , i would like to ask about sun solaries servers generations ? i hear about sparc and ultra . i want to know the versions , and is there other servers types ?? Thank

2. Filesystems, Disks and Memory

I have a file of type .for extension .In a guui based unix environment like solaris if I double click on that file a specific program designed by me has to run which takes this file as the parameter and exceutes the program. Can anyone help me?

3. UNIX for Dummies Questions & Answers

Two types of pipes?

What is the difference between: cd /tmp tar -cf - *.txt |gzip > tmp_txt.tar.gz and cd /tmp mknod pipe p gzip < pipe > /tmp/tmp_txt1.tar.gz & tar -cf pipe *.txt Apart from the fact that we have to create the pipe file manually, is there any difference in the performance of the two?...

4. UNIX for Dummies Questions & Answers

Check backup file size on backup tape

Hi, I performed backup on tape and I want to append more files to my previous backup on the same backup tape. But before I do that I need to know the backup file size of the first backup I performed so that I know the available size on the backup tape. Can someone help me what command I will use...

5. Shell Programming and Scripting

rsync backup mode(--backup) Are there any options to remove backup folders on successful deployment?

Hi Everyone, we are running rsync with --backup mode, Are there any rsync options to remove backup folders on successful deployment? Thanks in adv.

6. Homework & Coursework Questions

Help with using different types of GREP

1. The problem statement, all variables and given/known data: Hey there, I'm brand new to using Unix as I just started a course on it in my University, and I currently working through a worksheet which focuses on the many commands and methods of GREP (I'm working through the terminal command...

7. Shell Programming and Scripting

Help with Backup Shell Script for Network Device Configuration backup

HI all, im new to shell scripting. need your guidence for my script. i wrote one script and is attached here Im explaining the requirement of script. AIM: Shell script to run automatically as per scheduled and backup few network devices configurations. Script will contain a set of commands...

8. Shell Programming and Scripting

Backup script with selective file types only

i am looking for a backup script to be run in ssh which can move all *.php files only to a archive Eg. a folder has 5 sub folders with different file types, which can be mix of PDF, jpeg, gif etc etc. but the archive generated should only include the *.php files without breaking the directory...

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)

8 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

servers types

Discussion started by: tamemi

2. Filesystems, Disks and Memory

associated file types

Discussion started by: nhk_srd