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changing filenames in a directory to a number within a loop

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Top Forums Shell Programming and Scripting changing filenames in a directory to a number within a loop
# 15  
Old 12-13-2007
try this:
Code:
#!/bin/bash

ls -1 *.jpg | sort | while IFS= read fname ; do
    print "$fname"
done

# 16  
Old 12-13-2007
while i appreciate the effort vgersh, i haven't learned much this entire thread. this began as a simple script, but now i can see how it is much more difficult. why wouldn't i just write it in perl or python?

here's what your script returned
Code:
kumi@throne:atlas/images/photos % ./gallery
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"
Error: no "print" mailcap rules found for type "image/jpeg"

still, no one has explained WHY things are not working, they just throw me scripts that they haven't tried themselves. and i'm back at square one. what kind of forum is this?
# 17  
Old 12-13-2007
well.... we're are not your regular customer support help desk and cannot test ALL solutions..... we try to do our best - and once in awhile bugs/mispellings do slip by. You know how it goes, doncha?
If you could implement everything in say perl, why you came here asking for a shell solution to begin with? (this is a somewhat rhetorical question).

Try this:
Code:
#!/usr/local/bin/bash

ls -1 *.jpg | sort | while IFS= read fname ; do
    echo "[$fname]"
done

# 18  
Old 12-13-2007
to answer your question, because i already know perl and python. i'd like to pick up shell scripting to automate much of my daily-weekly-and monthly tasks.

anyway i tried your script and this time it works. but it's only printing out the filenames. what i need this script to do is change all the files with a specific extension to ascending numbers with the same extension:

wonder.jpg -> 1.jpg
sally.JPG -> 2.jpg
box.jpg -> 3.jpg

and so on and so on.

so, how do i establish a variable that will increment, much like in a for loop? because i think i've got it if i can figure out how to add a variable and add 1 to it each loop.

Code:
#!/bin/bash

ls -1 *.$1 | sort | while IFS= read fname ; do
    mv $fname ${i}.${1}
done

does that look right?
# 19  
Old 12-13-2007
Strange - you're the first person I know that goes from perl/Python/Ruby to shell scripting....
But anyhoo....
you're almost there...
Code:
#!/bin/bash
typeset -i i=1

ls -1 *.$1 | sort | while IFS= read fname ; do
     echo "mv [$fname] [{i}.${1}]"
    #mv "$fname" "${i}.${1}"
    ((i++))
done

when you're satisfied with what 'echo' outputs, comment it out, and uncomment the actual 'mv' line.
Last edited by vgersh99; 12-13-2007 at 02:08 PM..
# 20  
Old 12-13-2007
sooo it worked, at first. and i was very very excited. but when i tried the same script on the same files, it messed up. it removed like half of my images. at first i had 19 images with random names. then i ran the script and i had 19 images with names from 1.jpg - 19.jpg which is perfect. then, i ran the same script, on the same files, and it removed 1.jpg - 9.jpg..... why would it have done that? it shouldn't have done that. there's nothing in the script that i can see that would matter what the name of the file was before... what's the issue?

Code:
#!/bin/bash
typeset -i i=1

ls -a1 *.$1 | sort | while IFS= read fname ; do
    #echo "mv $fname ${i}.${1}"
    mv "$fname" "${i}.${1}"
    ((i++))
done

yeah i'm sure it's strange. i actually started out with php as my first programming language, which wasn't the best idea, but it wasn't too bad either. it provided a good transition, i will say that. i have pretty much most high-level scripting languages under my belt, except for shell scripting. also i'm trying to pick up sed and awk at the same time. those programs are friggin awesome!
Last edited by visitorQ; 12-13-2007 at 02:16 PM..
# 21  
Old 12-13-2007
most welcome - y'all come back now, y'hear!
Last edited by vgersh99; 12-13-2007 at 02:20 PM..
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