Optimizing bash loop Post: 303019053

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Simple loop in Bash

Hi, I want to do a simple loop where I have one column of text in a file and I want the loop to read each line of the file and do a simple command. The text file will be something like this: hostname1 hostname2 hostname3 hostname4 I am using Bash and have already come up with this to...

2. Shell Programming and Scripting

bash and ksh: variable lost in loop in bash?

Hi, I use AIX (ksh) and Linux (bash) servers. I'm trying to do scripts to will run in both ksh and bash, and most of the time it works. But this time I don't get it in bash (I'm more familar in ksh). The goal of my script if to read a "config file" (like "ini" file), and make various report....

3. Shell Programming and Scripting

Using variables created sequentially in a loop while still inside of the loop [bash]

I'm trying to understand if it's possible to create a set of variables that are numbered based on another variable (using eval) in a loop, and then call on it before the loop ends. As an example I've written a script called question (The fist command is to show what is the contents of the...

4. Shell Programming and Scripting

BASH loop inside a loop question

Hi all Sorry for the basic question, but i am writing a shell script to get around a slightly flaky binary that ships with one of our servers. This particular utility randomly generates the correct information and could work first time or may work on the 12th or 100th attempt etc !....

5. Shell Programming and Scripting

If loop in bash

Hello, I have a script that runs a series of commands. Halfway through the script, I want it to check whether everything is going alright: if it is, to proceed with the script, if it isn't to repeat the last step until it gets it right. My code so far looks like this, simplified a bit: ...

6. Shell Programming and Scripting

Bash For Loop Help

This is a short program I wrote to search through a directory and move files containing the keyword to a folder. #!/bin/bash echo 'What is the directory?' read DIR echo -e '\n' echo 'What is the keyword?' read KEY echo -e '\n' cd $DIR rmdir 'relevant_files' mkdir 'relevant_files'...

7. Shell Programming and Scripting

Speed up bash loop?

I am running the below bash loop on all the files of a specific type (highlighted in bold) in a directory. There are 4 awk commands that use the input files to search another and look for a match. The input files range from 27 - 259 and are a list of names. The file that is searched is...

8. Shell Programming and Scripting

Optimizing bash script

any way the following code can be optimized? FIRSTIN=$( HKIPP=$(echo ${TMFR} | egrep -v "mo|MO|Mo" | egrep "m |M ") HRAMH=$(echo ${TMFR} | egrep "h|H") HRAMD=$(echo ${TMFR} | egrep "d|D") HRAMW=$(echo ${TMFR} | egrep "w|W") HKIPPO=$(echo ${TMFR} |...

9. Shell Programming and Scripting

Help on for loop in bash

Hi, In the code "for loop" has been used to search for files (command line arguments) in directories and then produce the result to the standard output. However, I want when no files are named on the command line, it should read a list of files from standard input and it should use the command...

10. Shell Programming and Scripting

Optimizing for loop with awk or anything similar and portable

The variable COUNTPRO contains: COUNTPRO='Error__posting__message__to__EMR__Queue=0 Error__parsing__ReceiptSummary=0 xinetd__=4327 HTTP__1_1__500___=0 START__=2164 Marshaller__exception__while__converting__to__Receipt__xml=0 MessagePublisher__is__not__configured__correctly=0...

LEARN ABOUT OSF1

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)