perl, if directory exists Post: 302599798

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1. Shell Programming and Scripting

check if directory exists

Hi, I need to prompt for a response from a user to enter a path read dest_dir?"Please Enter Directory :" How do I do this until a valid directory is entered by the user. I can use to check the existence of the directory. However when I try the following I cannot get it to work. while ...

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Directory exists

Hi all, Sorry about this i'm sure this is a very silly question hence an easy answer but: I'm trying to write a script, part of which I want to check if a directory exists, if it doesn't then create it. Thanks for your help Tez

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How can I check if directory exists in a makefile

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Problem when test to see if directory exists

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check if directory and file exists

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Check whether file exists in directory

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Perl CGI: No such file and directory: Yet file exists?

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Check that at least one file exists in the directory.

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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)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

check if directory exists

Discussion started by: jerardfjay

2. UNIX for Dummies Questions & Answers

Directory exists

Discussion started by: tez

3. UNIX for Dummies Questions & Answers

How can I check if directory exists in a makefile

Discussion started by: zivsegal

4. Shell Programming and Scripting

Problem when test to see if directory exists

Discussion started by: trivektor