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Full Discussion: print from - to line of a file
Top Forums Shell Programming and Scripting print from - to line of a file Post 302600332 by alister on Monday 20th of February 2012 10:43:29 PM
Old 02-20-2012
GNU attempted to automagically optimize this very case, but apparently never managed to shake out all the bugs.

From http://git.savannah.gnu.org/cgit/sed.git/tree/ChangeLog:
Quote:
Tue Apr 14 17:34:54 PDT 1998 Ken Pizzini <ken@gnu.org>

* execute.c (execute_program, process_files, count_branches,
shrink_program): Added a first attempt at program optimization.
We now can quit early if we are running with the "-n"
and all of the commands are known to be valid only for
lines less than the current line. Thus the "sed" in
"foo | sed -n 1,2p" will print read three lines, printint
the first two, and then quit, regardless of how much longer
"foo" might run or output. This optimization does not buy
much in most cases (it sometimes even costs a little),
but when it does help it can help big. The code is
all conditionally compiled based on the
EXPERIMENTAL_DASH_N_OPTIMIZATION symbol being #defined,
so it can be easily omitted if it causes problems.

... snip ....

Sat May 23 16:07:09 HST 1998 Ken Pizzini <ken@gnu.org>

* sed/execute.c: #undef'd EXPERIMENTAL_DASH_N_OPTIMIZATION
because its code is buggy.
Many years later, in http://git.savannah.gnu.org/cgit/sed.../execute.c#n19
Code:
#undef EXPERIMENTAL_DASH_N_OPTIMIZATION	/*don't use -- is very buggy*/


Regards,
Alister
 

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LEARN ABOUT CENTOS

git-ls-remote

GIT-LS-REMOTE(1)						    Git Manual							  GIT-LS-REMOTE(1)

NAME

       git-ls-remote - List references in a remote repository

SYNOPSIS

       git ls-remote [--heads] [--tags]  [-u <exec> | --upload-pack <exec>]
		     [--exit-code] <repository> [<refs>...]

DESCRIPTION

       Displays references available in a remote repository along with the associated commit IDs.

OPTIONS

       -h, --heads, -t, --tags
	   Limit to only refs/heads and refs/tags, respectively. These options are not mutually exclusive; when given both, references stored in
	   refs/heads and refs/tags are displayed.

       -u <exec>, --upload-pack=<exec>
	   Specify the full path of git-upload-pack on the remote host. This allows listing references from repositories accessed via SSH and
	   where the SSH daemon does not use the PATH configured by the user.

       --exit-code
	   Exit with status "2" when no matching refs are found in the remote repository. Usually the command exits with status "0" to indicate it
	   successfully talked with the remote repository, whether it found any matching refs.

       --get-url
	   Expand the URL of the given remote repository taking into account any "url.<base>.insteadOf" config setting (See git-config(1)) and
	   exit without talking to the remote.

       <repository>
	   Location of the repository. The shorthand defined in $GIT_DIR/branches/ can be used. Use "." (dot) to list references in the local
	   repository.

       <refs>...
	   When unspecified, all references, after filtering done with --heads and --tags, are shown. When <refs>... are specified, only
	   references matching the given patterns are displayed.

EXAMPLES

	   $ git ls-remote --tags ./.
	   d6602ec5194c87b0fc87103ca4d67251c76f233a	   refs/tags/v0.99
	   f25a265a342aed6041ab0cc484224d9ca54b6f41	   refs/tags/v0.99.1
	   7ceca275d047c90c0c7d5afb13ab97efdf51bd6e	   refs/tags/v0.99.3
	   c5db5456ae3b0873fc659c19fafdde22313cc441	   refs/tags/v0.99.2
	   0918385dbd9656cab0d1d81ba7453d49bbc16250	   refs/tags/junio-gpg-pub
	   $ git ls-remote http://www.kernel.org/pub/scm/git/git.git master pu rc
	   5fe978a5381f1fbad26a80e682ddd2a401966740	   refs/heads/master
	   c781a84b5204fb294c9ccc79f8b3baceeb32c061	   refs/heads/pu
	   b1d096f2926c4e37c9c0b6a7bf2119bedaa277cb	   refs/heads/rc
	   $ echo http://www.kernel.org/pub/scm/git/git.git >.git/branches/public
	   $ git ls-remote --tags public v*
	   d6602ec5194c87b0fc87103ca4d67251c76f233a	   refs/tags/v0.99
	   f25a265a342aed6041ab0cc484224d9ca54b6f41	   refs/tags/v0.99.1
	   c5db5456ae3b0873fc659c19fafdde22313cc441	   refs/tags/v0.99.2
	   7ceca275d047c90c0c7d5afb13ab97efdf51bd6e	   refs/tags/v0.99.3

GIT

       Part of the git(1) suite

Git 1.8.3.1							    06/10/2014							  GIT-LS-REMOTE(1)
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