anonymous wrote:
> URL:
> <http://savannah.gnu.org/bugs/?24974>
>
> Hello,
>
> Could you explicitly document that "-1", "-2" and "-3" options
> of "comm" can be combined.
> This isn't obvious, and may lead some people [me!] to use
> other tools instead.
It's common for options to be combined unless otherwise stated,
but I take your point that it's perhaps a little confusing.
Perhaps this change would make it more obvious?
It's not removing info as the info removed is already
presented on the previous line.
diff --git a/src/comm.c b/src/comm.c
index 4ec7e4a..6f250a9 100644
--- a/src/comm.c
+++ b/src/comm.c
@@ -113,9 +113,9 @@ and column three contains lines common to both files.\n\
"), stdout);
fputs (_("\
\n\
- -1 suppress lines unique to FILE1\n\
- -2 suppress lines unique to FILE2\n\
- -3 suppress lines that appear in both files\n\
+ -1 suppress output of column 1\n\
+ -2 suppress output of column 2\n\
+ -3 suppress output of column 3\n\
"), stdout);
fputs (_("\
\n\
I might add some examples to the docs also, along the lines
of the following if I get a second. At least I should get
the docs for `comm` and `join` to reference each other.
# set operations on sorted files
comm file1 file2 | sed 's/^\t*//' #Union
comm -12 file1 file2 #Intersection
comm -13 file1 file2 #Difference
comm -3 file1 file2 | sed 's/^\t*//' #Symmetric Difference
join -a1 -a2 file1 file2 #Union
join file1 file2 #Intersection
join -v2 file1 file2 #Difference
join -v1 -v2 file1 file2 #Symmetric Difference
# set operations on unsorted files
sort file1 file2 | uniq #Union
sort file1 file2 | uniq -d #Intersection
sort file1 file1 file2 | uniq -u #Difference
sort file1 file2 | uniq -u #Symmetric Difference
cheers,
Pádraig.
p.s. Those new --check-order --nocheck-order options confuse me.
When they were added I only took a quick look at the implementation
rather than the interface (which Bo Borgerson kindly sped up for us).
Perhaps something like this would be clearer:
--check-order={none,mismatch,unsorted}
By default --check-order=mismatch is enabled.
I suppose it's too late to change now.
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