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Subject: RE:  "if" "then" "elif" "fi" "done"
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Date: Thu, 6 Sep 2001 08:36:36 +0200
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Thread-Topic:  "if" "then" "elif" "fi" "done"
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From: "Fritz, Wolfgang" <Wolfgang DOT Fritz AT datentechnik DOT com>
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> -----Original Message-----
> From: Harter, Pete [mailto:Pete DOT Harter AT itt DOT com]
> Sent: Thursday, September 06, 2001 8:02 AM
> To: 'cygwin AT cygwin DOT com'
> Subject: "if" "then" "elif" "fi" "done"
> 
> 
> 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.

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 DOT harter AT itt DOT com>
> 
> 
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