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Full Discussion: BASH: File name part to list reference problem.
Top Forums Shell Programming and Scripting BASH: File name part to list reference problem. Post 302441616 by SilversleevesX on Sunday 1st of August 2010 08:22:06 PM
Old 08-01-2010
Question BASH: File name part to list reference problem.
I've made a habit of including a four-letter "tail" on image file names I download from the Web, so I can both match them with IPTC Transmission References of my own making and rename them later using either a GUI renamer or a script I've written myself. Now I want to automate the process of writing the TRs to the files by way of Exiv2, leaving just the renaming stage of my routine before moving on to "filing them away" in categorized subfolders, CDs, etc.

Using OpenOffice Calc, I was able to create a list of these four-letter suffixes and the TRs to which they correspond, sort by the former and output to a text file. I added an extra field of IPTC Categories (also of my own making -- doesn't seem to matter when Categories is in the process of being dropped from the IIM). The script I have works with one file at a time, as my line-by-line command-line tests in a terminal emulator have proven, but something goes haywire when applied (as I have done so) to a whole folder of files and the complete list of suffixes, TRs and categories all at once.

I doubt I'm either using the right loop types to process this data, nor am I at all sure that I have the loops that are there nested correctly in the script. The output I've got so far happens to be the "natural" name of the last suffix in the list. What I want is the "natural" name corresponding to the suffix of the file being "looked at" by the script.

Here's the script as it reads so far:
Code:
for a in $(ls *.jpg); # Find files ending in "jpg" in the current directory
do
	bargirl=$(echo $a)
	while read 'line';
	do
		souse=$(echo $line)
		drunk=${souse%:*}
		verydrunk=$(echo $souse | cut -d":" -f2)
		firstdrink=$(echo $verydrunk | cut -d, -f1)
		seconddrink=$(echo $verydrunk | cut -d, -f2)
		thirddrink=$(echo $verydrunk | cut -d, -f3)
done<downloads-xreference.txt # The text file with the three columns (suffix, natural name and Category). Terminate the 'while read' loop
jackdaniels=$(echo ${bargirl:(-4)}) # Take the ".jpg" off the file name	
singlemalt=$(echo $bargirl | cut -d'.' -f1) # Ditto
puregrain=$(echo ${singlemalt%????}) # Now strip the suffix off -- comes from the renaming script
jimbeam=$(echo ${singlemalt:(-4)}) # "What was that suffix code again?"
if [[ $jimbeam -eq $seconddrink ]]; # Does it exist in column 3 of the text file? Does it match the one on the file we're looking at? 
then
	chaser=$firstdrink # Variable "chaser" should be the matched 4-letter suffix.
	echo $chaser # "Show me the money."
fi
done #Terminates the 'for' loop

BZT
 

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checkbashisms

CHECKBASHISMS(1)					      General Commands Manual						  CHECKBASHISMS(1)

NAME

       checkbashisms - check for bashisms in /bin/sh scripts

SYNOPSIS

       checkbashisms script ...
       checkbashisms --help|--version

DESCRIPTION

       checkbashisms, based on one of the checks from the lintian system, performs basic checks on /bin/sh shell scripts for the possible presence
       of bashisms.  It takes the names of the shell scripts on the command line, and outputs warnings if possible bashisms are detected.

       Note that the definition of a bashism in this context roughly equates to "a shell feature that is not required to be supported  by  POSIX";
       this means that some issues flagged may be permitted under optional sections of POSIX, such as XSI or User Portability.

       In  cases  where  POSIX	and  Debian  Policy  disagree, checkbashisms by default allows extensions permitted by Policy but may also provide
       options for stricter checking.

OPTIONS

       --help, -h
	      Show a summary of options.

       --newline, -n
	      Check for "echo -n" usage (non POSIX but required by Debian Policy 10.4.)

       --posix, -p
	      Check for issues which are non POSIX but required to be supported by Debian Policy 10.4 (implies -n).

       --force, -f
	      Force each script to be checked, even if it would normally not be (for instance, it has a bash or non POSIX shell shebang or appears
	      to be a shell wrapper).

       --extra, -x
	      Highlight lines which, whilst they do not contain bashisms, may be useful in determining whether a particular issue is a false posi-
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       --version, -v
	      Show version and copyright information.

EXIT VALUES

       The exit value will be 0 if no possible bashisms or other problems were detected.  Otherwise it will be the sum of the following error val-
       ues:

       1      A possible bashism was detected.

       2      A file was skipped for some reason, for example, because it was unreadable or not found.	The warning message will give details.

SEE ALSO

       lintian(1).

AUTHOR

       checkbashisms  was originally written as a shell script by Yann Dirson <dirson@debian.org> and rewritten in Perl with many more features by
       Julian Gilbey <jdg@debian.org>.

DEBIAN
								 Debian Utilities						  CHECKBASHISMS(1)
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