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Re: Diff and grep problems
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[Ugh - top-posting. Reformatted]
>> This is not cygwin specific. Read up on 'info diff' - the -X option is a
>> file listing patterns of FILENAMES to ignore when diffing directories,
>> not
>> LINES to ignore within file pairs being diffed. Try -I instead.
According to Adrian Marsh on 8/25/2005 6:40 AM:
> Hi Eric,
>
> Thanks for the help. I'd already "man diff" and it doesn't read like it
> applies only to files, but info tells me more :
Like I said, 'info diff' is more informative than 'man diff', for a
reason. The GNU project prefers info to man documentation.
>
>> `-I REGEXP'
>> `--ignore-matching-lines=REGEXP'
>> Ignore changes that just insert or delete lines that match REGEXP.
>> *Note Specified Lines::.
>
>
> However - this is a *changed* line, not an insert/delete so I don't
> think it will work.
Have you actually tried it? A changed line is a combination
insert/delete, so it does work.
$ cat > 1
a
b
c
$ cat > 2
a
bb
c
$ diff 1 2
2c2
< b
- ---
> bb
$ diff -Ib 1 2
$
Any more non-cygwin specific questions on this topic are better asked on a
newsgroup related to using unix utilities.
> So my best guess is that I have to pre-grep the
> files involved. However this brings me onto the second problem, where
> grep seems to have the same issue (unless -f in grep ALSO only filters
> filenames..)
> But when I try this same thing in cygwins version of grep, it fails
> (note the manual grep is ok).
>
>> C:\backups\__cisco_backups>cat c.txt
>> ntp
>>
>> C:\backups\__cisco_backups>c:\cygwin\bin\grep -f c.txt a.txt
>>
>> C:\backups\__cisco_backups>c:\cygwin\bin\grep ntp a.txt
>> ntp clock-period 17179955
>> ntp source Vlan135
>> ntp server 135.86.68.147
I'm guessing you have line-ending problems. And to make this email
cygwin-specific, why aren't you using a Unix shell (bash, ksh, ...)
instead of Windows .bat files? Also, check whether you are using binary
mount points.
- --
Life is short - so eat dessert first!
Eric Blake ebb9@byu.net
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