[ILUG] ksh question

[Braun Brelin]

Niall,

Thanks for reminding me.  I'd completely forgotten about that.  :-)

Braun


On 5/8/08, Niall Sheridan <nsheridan at gmail.com> wrote:
>
> That's all Make syntax, not shell syntax.
> $@ is a shorthand way of referring to the target, $< refers to the related
> file.
>
> Say given the following make snippet:
>
> monday: tuesday
>   echo $< $@
>
> 'make monday' will return 'tuesday monday'
>
>   - Niall
>
>
> On Thu, May 8, 2008 at 2:11 PM, Braun Brelin <bbrelin at gmail.com> wrote:
> > Hello all,
> >
> >  Someone sent me the following lines in a Makefile:
> >
> >  XML_RULE = @echo " xml-rule $< xml2hpp.xsl $@" && \
> >  $(JAVA_BIN) -cp $(XT_DIR)/xp.jar:$(XT_DIR)/xt.jar \
> >  com.jclark.xsl.sax.Driver \
> >  $< $(CMKCMK)/xml2hpp.xsl $@
> >
> >  They wanted to know what the "$<" and "$@" symbols mean.
> >
> >  The make program is running under ksh.
> >
> >  The $@ is almost certainly the builtin array $@ for command line
> arguments,
> >  but I'm having a hard time finding any reference for $<.  Is this
> command
> >  substitution
> >  a la $(<some_file) ?
> >
> >  I know that $< in Perl is the real uid of the
> >  program but that doesn't seem to make any sense in this context.
> >
> >  My guess is that it's some variant of input redirection.
> >
> >  Anyone else know what $< is in KSH?
> >
> >  Thanks,
> >
> >  Braun Brelin
>
> >  --
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>