On Mon, Oct 22, 2012 at 10:05 PM, Marc Weber <[email protected]> wrote:
> If they are sorted you can split into pieces, eg create an
> a,b,c file and compare a(old) with a(new) and b(old) with b(new) only.
One could as well read records from both files at the same time and
output diffs while doing that. If the data is line based, there are
tools already for comparing two sorted files:
$ comm --help
Usage: comm [OPTION]... FILE1 FILE2
Compare sorted files FILE1 and FILE2 line by line.
With no options, produce three-column output. Column one contains
lines unique to FILE1, column two contains lines unique to FILE2,
and column three contains lines common to both files.
-1 suppress column 1 (lines unique to FILE1)
-2 suppress column 2 (lines unique to FILE2)
-3 suppress column 3 (lines that appear in both files)
--check-order check that the input is correctly sorted, even
if all input lines are pairable
--nocheck-order do not check that the input is correctly sorted
--output-delimiter=STR separate columns with STR
--help display this help and exit
--version output version information and exit
Note, comparisons honor the rules specified by `LC_COLLATE'.
Examples:
comm -12 file1 file2 Print only lines present in both file1 and file2.
comm -3 file1 file2 Print lines in file1 not in file2, and vice versa.
Report comm bugs to [email protected]
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'comm invocation'
If files are not line based it may be possible to convert them to a
line based format and then use comm like this:
$ comm <(conver old) <(convert new)
Kind regards
robert
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
-- You received this message because you are subscribed to the Google Groups
ruby-talk-google group. To post to this group, send email to
[email protected]. To unsubscribe from this group, send email
to [email protected]. For more options, visit this
group at https://groups.google.com/d/forum/ruby-talk-google?hl=en
