Charles Calvert wrote:
Since we're engaging in a little friendly pedantry...
:-)
On 10/27/2009 6:30 AM, Keith MARSHALL wrote:
[attributions added back in]
This utterly abysmal mail client, which my employer insists I use, messes
them up horrendously; sorry about that.
On 10/23/2009 10:56 AM, Charles Calvert wrote:
On 10/23/2009 10:31 AM, bradda...@comcast.net wrote:
I can't seem to get awk to work.
Here is the command line I'm trying to use:
svn ls -R | awk print $1
Try:
svn ls -R | awk {print $1}
The default rule must be enclosed in braces.
Actually, this is not strictly so; while your suggested remedy
is correct in this instance, your explanation is wrong.
An awk rule, (usually called a statement,
Most of my understanding of awk comes from Effective awk Programming
and sed awk in which Mr. Robbins tends to use the word rule rather
than the word statement, so I think that usually depends on the
context. I would agree that statement has a more well defined meaning
in a programming context, but plenty of programming languages have their
little variations on terminology.
I didn't mean to impugn your use of the word rule; just introducing
what I believe to be the more common terminology, esp. in the formal
documentation of awk, (where, FTR, my match-criterion is usually
referred to as a pattern; see:
http://www.opengroup.org/onlinepubs/009695399/utilities/awk.html ).
for it is a part
of an awk script which itself comprises one or more of such
statements), comprises two parts:
match-criterion { action [; ...] }
It's the *action* part of the statement which must be enclosed
in braces, and this applies to *all* statements;
I did not imply the opposite. Brad failed to enclose the action in
braces and I stated that he needed to do so.
Exactly so; your suggested remedy was correct, as I said. However...
I don't see how one can
reasonably conclude that this implies that braces should not enclose
any other action. Perhaps I have misunderstood your use of emphasis
in this case?
I thought your wording may have been potentially confusing; you stated
that the default *rule* must be enclosed in braces (my emphasis), but
if we accept, in your terminology, that rule is synonymous with the
statement of mine, then that would be incorrect: it is only the
*action* part of the rule which must be enclosed in braces, (and
there really isn't any realistic concept of a default rule; the awk
language specification allows *either* the pattern or the action to be
defaulted, but never both in the same statement).
(in fact, if any statement is given at all, there is no applicable
concept of a default; any statement may omit either the
match-criterion part, which then defaults to matching *every* input
line, or it may omit the action part, which then defaults to echoing
the entire matched input line to the output stream.
I should have said the empty pattern[1], but my mind came up with
default instead.
Ah! With that qualification, your analysis becomes correct, if not as
clearly expressed as it might have been.
Thanks for the clarification.
You're welcome. I thought it necessary, to avoid possibly confusing an
OP who clearly isn't experienced in awk programming.
--
Regards,
Keith.
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