diff part of file - Shell Programming and Scripting

minifish · #1 02-20-2008

Hello experts,
I have 2 files
file1:
lalalala good file

file2:
lblblblb good file

these two files are the same in my test case, how can I start compare after certain number of characters? or is there a better way to do this?

Thank you

joeyg · #2 02-20-2008

Are the files all in one line?

You ask about comparing files after a certain number of characters, so are you looking to ignore a fixed number characters on each line for each file?

If those are the 'true' files, then a solution could be proposed.
However, if there is more to the samples, it would be helpful to see.

minifish · #3 02-20-2008

Quote:

Originally Posted by joeyg

Are the files all in one line?

You ask about comparing files after a certain number of characters, so are you looking to ignore a fixed number characters on each line for each file?

If those are the 'true' files, then a solution could be proposed.
However, if there is more to the samples, it would be helpful to see.

The files contain more than 1 line, a more likely example would be:

file1:
lalalala good file
lalblala good file
lalalalb good file
lalalbla good file

file2:
lblblblb good file
lblblclb good file
lblclblb good file
lclblblb good file

compare:
#file1 and file2 are the same

so I want to start compare after say 8 characters on every line in the two files.

joeyg · #4 02-20-2008

I created two sample files (note I purposefully made a difference in the 2nd file calling something bad instead of good - to see some output from a diff command)

Code:

> cat tfile1
lalalala good file
lalblala good file
lalalalb good file
lalalbla good file
> cat tfile2
lblblblb good file
lblblclb good file
lblclblb good file
lclblblb bad file

then, using the following script:

Code:

> cat cfile
#! /bin/bash

f1="tfile1"
f2="tfile2"
f1out=$f1".out"
f2out=$f2".out"

cat tfile1 | cut -c10- >$f1out
cat tfile2 | cut -c10- >$f2out

diff $f1out $f2out

results in:

Code:

> cfile
4c4
< good file
---
> bad file

minifish · #5 02-20-2008

Quote:

Originally Posted by joeyg

I created two sample files (note I purposefully made a difference in the 2nd file calling something bad instead of good - to see some output from a diff command)

Code:

> cat tfile1
lalalala good file
lalblala good file
lalalalb good file
lalalbla good file
> cat tfile2
lblblblb good file
lblblclb good file
lblclblb good file
lclblblb bad file

then, using the following script:

Code:

> cat cfile
#! /bin/bash

f1="tfile1"
f2="tfile2"
f1out=$f1".out"
f2out=$f2".out"

cat tfile1 | cut -c10- >$f1out
cat tfile2 | cut -c10- >$f2out

diff $f1out $f2out

results in:

Code:

> cfile
4c4
< good file
---
> bad file

Sorry, can't express enough of my thanks~~~~~~
I was stuck on it for so long.
THANK YOU

minifish · #6 02-20-2008

one interesting thing is using "cat tfile1 | cut -c10- >$f1out "
tfile1 and f1out must be different.
is there any way to replace the same file?
what about "sed"?

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