Shell Programming and Scripting

I got a game that output map tiles of the session with the 0,0 position at the place you login/spawn.
That makes making a map somewhat troublesome since the 0,0 will move.

So I've been looking for a way to change the numbers in the filenames of all files in a folder by a certain value.

The tiles are named "tile_X_Y.png".

I tried to use awk to get the X and Y numbers out, add the values to them and then rename the file, but are not quite sure how to manage that.

I'm not really sure how to use one awk's output as another awk's input

I have edited the code since posted.

Code:

#! /bin/sh  
v1c=5 
echo $v1c 
v2c=-5 
echo $v2c 
cd ./tiles 
for tile in * 
do 
echo "start" 
n_tile=`(awk -F '.' '{print $1}')` //Will remove .png
echo "1" 
v1=`echo $n_tile | awk -F '_' '{print $2}'` //Will take the X
echo "2" 
v2=`echo $n_tile | awk -F '_' '{print $3}'` //Will take the Y
echo "3"  
move="tile_"+$v1+v1c+"_"+v2+v2c+".png" 
echo $move  
mv $tile $move 
done

It feels like there must be a way that's more effective than this script, and I don't really know how to get this script to work.

Thanks in advance.

Probably. Reverse-engineering that script -- which I'm not sure even works, and have no way to test without your input and output -- would take a lot more time than it would starting from the input you have and the output you want, however. Could you post it?

Try this (remove echo when your confident it's going to do what you want):

Code:

#!/bin/sh
v1c=5
v2c=-5
cd ./tiles
for tile in *
do
  echo mv $tile `echo $tile | awk -vv1=$v1c -vv2=$v2c -F[_.] '{print $1 "_" $2+v1 "_" $3+v2 ".png" }'`
done

I'm afraid I'm not sure what you mean.

But if I have a file called "tile_10_-5.png" I want to be able to add/subtract to the two numbers (10 and -5).

And it should add/subtract that to every filename in the folder.

So if I wanted to add -5 and 3 to the two it should be "tile_5_-2.png" in that example.


If you mean the script, it does not work at the moment, it stops at the "
n_tile=`(awk -F '.' '{print $1}')` //Will remove .png" without any messages.

Hmm... renaming the files around at every turn, that seems awkward...
How about you create one textfile, that will have a look-up table defining the mapping (x,y) --> png, something like:

Code:

-10 -5 pic1.png
-10 -4 pic2.png
-10 -3 pic1.png
...
 10 5 pic28.png

And then you'd update this file accordingly. This way you wouldn't be dependent on the filename of pngs, and you don't need to have redundant copies of pngs if two tiles have the same image, and other advantages.

Thanks a lot!
It seems subtractions does not work though, but other than that it works like a charm.

Edit: Sorry about that, accidently added a "-" instead of a "+".