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Shell Script that identifies changes between 2 files and then combines them

 
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# 1  
Old 04-15-2008
Shell Script that identifies changes between 2 files and then combines them
Hi,

I've been trying to figure out a script that would enable me to find the changes made from an original file say x then to a duplicate called y then revert those changes.

Simple, but I'm already cracking my head over this one, Can someone help me out?

say file x:-

abc1
def2
ghi3
jkl

then file y:-

abc
def
ghi3


What do I do?
# 2  
Old 04-15-2008
diff will create an ed script that can change one file to another. Read the man page for diff. The script will take file1 and make it be the same as file2, if you want - and if I got what you mean.
# 3  
Old 04-15-2008
Hi Jim,

Thanks I looked into doing diff onto those files and can see it but am now trying to figure out the scripting part that can do it.

example:-

it's executed being able to take in 2 arguments

$ ./compare.ksh file1 file2

first it makes a backup of file1 called file1.ori
then it compares what is in file2
then adapts file2 into file1
# 4  
Old 04-15-2008
Is there a reason you cannot simply use the cp command to copy file1 to file2?
# 5  
Old 04-16-2008
Hi.

I think Jim's solution is the simplest.

If you are interested in the series of changes to a file (a history, versions, etc.), two basic tools that you could consider are rcs and bzr. See man pages for details ... cheers, drl
# 6  
Old 04-16-2008
For version control, also look at subversion and CVS ... and git and darcs and monotone and mercurial and what have you (-:

Seriously, if you want version control, you probably want something more than just rcs, which is very old. bzr is one of a large group of "next-generation" tools but it's by no means the only one, although it's fairly popular.
# 7  
Old 04-16-2008
Quote:
I think Jim's solution is the simplest.
Agree!

If you want to see the differences in two files, I personally find sdiff "or if your OS supports it, xdiff" these give more human readable output.


Code:
sdiff file1 file2 
# use -s flag if you only want to see differences.
# if you expect large amount of changes, redirect output to a file

 
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