convoluted code Post: 302667073

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The Lounge War Stories convoluted code Post 302667073 by Corona688 on Thursday 5th of July 2012 02:45:43 PM

07-05-2012

Registered User

Quote:

Originally Posted by alister

My post isn't intended to suggest that bash (or dash or bourne sh) violate the standard -- I'm aware that POSIX allows a shell to execute each component of a pipeline in either the current environment or a subshell (ksh is compliant in this respect); the post is merely a response to methyl's rumination on the popularity of the idiom, identifying one popular resource which promotes it.

You weren't that wordy about it at the time; you simply said your first impulse was to "blame GNU bash". That's a bit of a sore point -- BASH, as a shell many new users start with, has a low value in some admin's eyes -- the habit of new users calling all shell scripting "bash scripts" doesn't help -- and seems to get blamed for everything from their own bugs to poor weather as a result. Even though it's just doing what a Bourne shell does. Blame him if you must. Smilie

Quote:

In my opinion, the ksh approach makes life a little easier.

Perhaps, but it's not something that can really be changed now. Bourne is what it is, and changing the ordering would change what happens in a lot of scripts because it cuts both ways -- suddenly scripts could be setting variables in the main shell they never did before...

I bet BASH'll add it as one of it's many fiddly setopt options someday.

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makesh

MAKESH(1)						      General Commands Manual							 MAKESH(1)

NAME

       makeSH - a .SH script maker

SYNOPSIS

       makeSH files

DESCRIPTION

       MakeSH  examines  one or more scripts and produces a .SH file that, when run under sh, will produce the original script.  The .SH script so
       produced has two sections containing code destined for the output.  The first section has variable substitutions performed  on  it  (taking
       values  from  config.sh), while the second section does not.  MakeSH does not know which variables you want to have substituted, so it puts
       the whole script into the second section.  It's up to you to insert any variable substitutions in the first section for any values you want
       from config.sh.

       You  should  run  makeSH from within your top-level directory and use the relative path to the file as an argument, so that the "Extracting
       ..." line printed while running the produced .SH file later on will give that same path.

AUTHOR

       Larry Wall <lwall@netlabs.com>

SEE ALSO

       pat(1), metaconfig(1), makedist(1).

BUGS

       It could assume that variables from metaconfig's Glossary need to be initialized in the first section, but I'm too lazy to make it do that.

								       LOCAL								 MAKESH(1)