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Top Forums Shell Programming and Scripting Convert creates multiple files Post 303027169 by bakunin on Monday 10th of December 2018 10:34:47 AM
Old 12-10-2018
Quote:
Originally Posted by Kangol
GNU Trisquel 7.0 with Gnome Version 3.8.4running bash
Well, in this the bash version. You see why it is necessary to state your surroundings?

Code:
bakunin@host $ cat myconvert.sh
#! /bin/bash
local fIn="$1"
local chExt=".png"
fIn="${fIn#${chExt}}"

if ! [ -f "${fIn}.${chExt}" ; then
     echo "Cannot find file ${fIn}.${chExt}." >&2
     exit 1
fi
if convert "$fIn.$chExt" -crop 3000x4500 +repage -format png "${fIn}--cr.${chExt}" ; then
     rm "${fIn}-cr-1.${chExt}"
     rm "${fIn}-cr-2.${chExt}"
     rm "${fIn}-cr-3.${chExt}"
     mv "${fIn}-cr-0.${chExt}" "${fIn}-cr.${chExt}"
     exit 0
fi

exit $?

Quote:
Originally Posted by Kangol
The task is to understand how it is creating the additional files, what are they? Has anybody encountered them before?
I also want to understand if my image is created properly. Are the headers correct, offset etc
This is a question best asked an expert in picture processing. I have never used this (or any other picture processing) program at all.

I hope this helps.

bakunin
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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