Your explanation is clear and I'll consider including your version of jw in
the next release. Your example doesn't seem quite quite (/j.jar doesn't get
added to JPATHj601) but the idea is clear. Thanks.
----- Original Message -----
From: "Miller, Raul D" <[EMAIL PROTECTED]>
To: "Beta forum" <[email protected]>
Sent: Tuesday, April 25, 2006 5:53 PM
Subject: RE: [Jbeta] 601 m beta available for linux32
Eric Iverson wrote:
I'm not familiar with the bash syntax you are using.
Google finds me:
http://vertigo.hsrl.rutgers.edu/ug/shell_help.html
Skip down to "Conditional Reference"
(And note that none of this is specific to bash --
this has been bourne shell syntax since long before
bash was written.)
I assume the intent is to use JPATHj601 if defined
and !/j601 if not. Could you please explain what
is going on.
$name is /bin/sh shorthand to reference a variable
${name} is standard /bin/sh syntax to reference a variable
${name-value} is /bin/sh syntax to reference a variable
and use value if the name is undefined.
Also note that "$@" is standard shell syntax to reference
command line parameters without breaking on whitespace
within those parameters. In contrast, $* breaks apart
any parameters which contain whitespace.
None of the above is bash specific -- this has been
part of shell syntax since long before bash was written.
Bash (and, I believe, any POSIX version of /bin/sh) also
supports an equivalent ${name:-value} syntax.
If you have cygwin man pages installed, from the
cygwin shell try:
man ash
/:-
(In other words, search for :- on the manual page
for ash -- the BSD /bin/sh.)
If this works as you indicate it is a nice improvement
and will be included in the release.
If you want to experiment with the above, I recommend
using parenthesis. Parenthesis fork another copy of
the shell, so variable assignments are termporary.
(echo ${X-0})
(X=1; echo ${X-0})
The best way to illustrate "$@" is with a for loop
(set "a b c" "d e"; for x in "$@"; do echo ".$x."; done)
(set "a b c" "d e"; for x in $*; do echo ".$x."; done)
I hope this helps.
--
Raul
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