AW: "if" "then" "elif" "fi" "done"

["Ralf Habacker" <Ralf.Habacker@freenet.de>]

> >
> > Dear Cygwin:
> >
> > I'm using Cygwin on NT, writing a bash script to catenate 241 files
> > together.  I can't seem to get the  "elif" "fi" "done"
> > statements to work.
> > Using "then" seem to have no effect.
> >
> > In particular, "elif","fi","done" all cause syntax errors.
> > I've done a "man
> > bash", which tells me that the "fi", "elif", "done", etc.
> > ought to work.  I
> > can't find much on the www.cygwin.com about syntax.
>
> That's because this is not a cygwin specific problem. Try to find a
> standard book about shell programming.
>
> The "if" problem:
> "if, elif" needs a "then"
>
> if condition ; then
>    do_something
> elif other_condition ; then
>    do_other_things
> fi
>
> You may place "then" on a seperate line:
> if condition
> then
>   do_something
> fi
>
> A special trap with "["
>
> if [ $i -gt 5 ] ; then
> #   ^ this blank is a must
>
> reason: "[" is an alias name for the command "test", the above really
> means:
>
> if test $i -gt 5 ; then
> ...
> fi
>
> do a "man test" to find the differences between "-gt" and ">" etc.
>
the cygwin manpage of "test" doesn't say anything about the difference between
this.

> Wolfgang (hoping the M$ outlook does not mangle the formatting too
> much...)
>
> >
> > Here's my commands:
> >
> > #!/bin/bash -x
> > pdt="/cygdrive/e/temps"
> > pcase="case2"
> > #
> > cat $pdt/$pcase/$pcase'001'.bdf > $pdt/$pcase.temp
> > pi=2
> > while [$pi < 241]
> > do
> >   if [$pi < 10]
> >     cat $pdt/$pcase/$pcase'00'$pi.bdf >> $pdt/$pcase.temp
> >   elif
> >     if [$pi < 100]
> >       cat $pdt/$pcase/$pcase'0'$pi.bdf >> $pdt/$pcase.temp
> >     elif [$pi >= 100]
> >       cat $pdt/$pcase/$pcase$pi.bdf >> $pdt/$pcase.temp
> >     fi
> >   fi
> >   echo $pi
> >   pi=$pi+1
> > done
> >
> > I revised the commands (by trial & error) to the following,
> > which gives no
> > syntax error except that it says "unexpected end of file"
> > after the last
> > line:
> >
> > #!/bin/bash -x
> > pdt="/cygdrive/e/temps"
> > pcase="case2"
> > #
> > cat $pdt/$pcase/$pcase'001'.bdf > $pdt/$pcase.temp
> > pi=2
> > while [$pi < 241]
> > do
> >   if [$pi < 10]
> >     cat $pdt/$pcase/$pcase'00'$pi.bdf >> $pdt/$pcase.temp
> >   ei
> >     if [$pi < 100]
> >       cat $pdt/$pcase/$pcase'0'$pi.bdf >> $pdt/$pcase.temp
> >     ei [$pi >= 100]
> >       cat $pdt/$pcase/$pcase$pi.bdf >> $pdt/$pcase.temp
> >     endif
> >   endif
> >   echo $pi
> >   pi=$pi+1
> > enddo
> >
> > Please help.  Thanks
> >
> > Pete Harter
> > ITT A/CD Mechanical Analysis
> > 219-451-6865
> > < mailto:pete.harter@itt.com >
> >

Ralf


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