UNIX for Dummies Questions & Answers

Hi,

This is probably quite simple for an expert, but I keep getting confused about the best approach, grep, awk, sed.

What I have is a range of files numbered 1 to 100. They go

file1.txt
file2.txt

and so on

In each file I need to find and replace a couple of items and rename add a suffix.

Eg file1-new.txt
file2-new.txt

I'd like to be able to run the shell script for example say it's called Renamer.sh in the command line like this Renamer 1

This would grab the file1.txt create file1-new.txt

Renamer 2 would grab the file2.txt create file2-new.txt and so on.

The find and replace I need is to search one large chunk of text that is in xml format so will include characters such as < " and /

Can someone please point me in the right direction?

Thanks,
Travis

Also

---------- Post updated at 12:20 PM ---------- Previous update was at 11:41 AM ----------

PS. I am working in Mac OSX so may not have the full unix commands.

You can use sed -i -e option.

For example.
If you have files file1 and file2.

file1
abc
cfg abc dfd

file2
cfg abc dfd
fjsl
abc
You can replace abc with xyz in both files.

Code:

sed -i -e file*

You will have
file1 (New file2 with all abc replaced with xyz)
file2 (New file2 with all abc replaced with xyz)
file1-e (Your old file1)
file2-e (Your old file2)

Hope this helps.

Thanks but I don't think this will do what I want.

I need to create a new file with a suffix added to it. In that file some text needs to be replaced.

Not sure your solution does either of these things.

You can move files around as you wish.

Code:

mv file1 file1-suffix; mv file1-e file1;

(Can be done in bulk using awk)
OR
you can use sed to edit files one by one.
You can write a wrapper around it (A loop picks up each file and fire the following command)

Code:

cat filen|sed -i 's/<old pattern>/<new pattern>/g' > filen-suffix

Hope this helps.

---------- Post updated at 11:51 PM ---------- Previous update was at 11:49 PM ----------

You can move files around as you wish.

Code:

mv file1 file1-suffix; mv file1-e file1;

(Can be done in bulk using awk)
OR
you can use sed to edit files one by one.
You can write a wrapper around it (A loop picks up each file and fire the following command)

Code:

cat filen|sed 's/<old pattern>/<new pattern>/g' > filen-suffix

Hope this helps.

Try this.

Code:

#!/bin/ksh
for i in {1..100}
do
        sed 's/<pattern to search>/<pattern to replace>/g' file$i.txt > temp
        mv temp file$i-new.txt
done

Hi guys,

Thanks for your help.

Here's my solution, which is not very elegant. I've run the sed 4 times. The reason I've done it this way is I can avoid any problems with odd xml characters such as < /. Also the problem where I want change 256 to 512 then 128 to 256 I think needs to be done in a specific order. I saved this below in a file called Replacer.sh.

Code:

#!/bin/sh

cat filename$1.tmx|sed 's/"32"/"64"/g' > filename$1-suffix.tmx
cat filename$1-suffix.tmx|sed 's/"256"/"512"/g' > filename$1-suffix.tmx
cat filename$1-suffix.tmx|sed 's/"128"/"256"/g' > filename$1-suffix.tmx
cat filename$1-suffix.tmx|sed 's/imageName.png/imageName-suffix.png/g' > filename$1-suffix.tmx

Then to run it I call

Code:

sh Replacer.sh 1

and

Code:

sh Replacer.sh 2

etc.

I know I can run it all as a loop but at the moment I want to run it on one file at a time and test that file in my other program.

The only other issue is I don't think I can overwrite the suffix file if it already exists. No doubt there is a command to overwrite, but i couldn't find it.

You might have guessed from the .tmx these are tilemaps that need a low res and high res version.