Reading input to create a variable in a script? Post: 11939

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#!/usr/bin/sh echo "Enter reason:" echo "> \c" read $reason $reason >> access.log This doesnt work for me. Can someone tell me how I would read the input from what the person types, and then append that to the log file? Regards

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#!/bin/sh rpt="/export/home/legato/rpt_offsite"/test_eject.tape cat <$rpt while read line do echo $line perform routine done I am trying to read the contents of this file line by line and perform a routine for each line read. The file contents are numbers.. What is wrong with my...

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Reading content of a variable to create a new one?

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[SH] Problem reading input in script

Alright, so the goal of my script is to read text from standard input and store it into a file using the ex-editor: so far i've got this, but it doesn't work. #!/bin/s read text ex $1 >> HERE text HERE I don't get any errors either, so i don't know what i'm doing wrong.

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This is one of the strangest things that's happening to me. I'm writing a new Perl script that is trying to read a file. The file is originally in .mof format, but I also saved the contents into a .txt file. As a simple test, I wrote this: #!/user/bin/perl -w use strict; ...

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Need to develop a script to create a report reading multiple server logs

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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)

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Reading content of a variable to create a new one?

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