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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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LEARN ABOUT OSX

script

SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME

     script -- make typescript of terminal session

SYNOPSIS

     script [-akq] [-t time] [file [command ...]]

DESCRIPTION

     The script utility makes a typescript of everything printed on your terminal.  It is useful for students who need a hardcopy record of an
     interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).

     If the argument file is given, script saves all dialogue in file.	If no file name is given, the typescript is saved in the file typescript.

     If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell.

     The following options are available:

     -a      Append the output to file or typescript, retaining the prior contents.

     -k      Log keys sent to program as well as output.

     -q      Run in quiet mode, omit the start and stop status messages.

     -t time
	     Specify time interval between flushing script output file.  A value of 0 causes script to flush for every character I/O event.  The
	     default interval is 30 seconds.

     The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if
     ignoreeof is not set) for the C-shell, csh(1)).

     Certain interactive commands, such as vi(1), create garbage in the typescript file.  The script utility works best with commands that do not
     manipulate the screen.  The results are meant to emulate a hardcopy terminal, not an addressable one.

ENVIRONMENT

     The following environment variable is utilized by script:

     SHELL  If the variable SHELL exists, the shell forked by script will be that shell.  If SHELL is not set, the Bourne shell is assumed.  (Most
	    shells set this variable automatically).

SEE ALSO

     csh(1) (for the history mechanism).

HISTORY

     The script command appeared in 3.0BSD.

BUGS

     The script utility places everything in the log file, including linefeeds and backspaces.	This is not what the naive user expects.

     It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.

     When running in -k mode, echo cancelling is far from ideal.  The slave terminal mode is checked for ECHO mode to check when to avoid manual
     echo logging.  This does not work when in a raw mode where the program being run is doing manual echo.

BSD
								 January 22, 2004							       BSD
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