ksh construct


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# 1  
ksh construct

Hi Guys,

could someone tell me what this ksh construct does

typeset -r PROG_PWD=${0%/*} does

I understand the -r for readonly but I would very much appreciate a definitive account of what this will set $PROG_PWD to.

If I run this at the cmd line it it gets set to /usr/bin but I would like to know .....why?

cheers
# 2  
typo

sorry - there is an extra 'does' in the post...

ignore the one on the 'typeset' line

cheers
# 3  
From the ksh man page:

Code:
${parameter%word}       Remove Smallest Suffix Pattern.  The
                             word   is   expanded  to  produce  a
                             pattern.  The  parameter   expansion
                             then  results in parameter, with the
                             smallest  portion  of   the   suffix
                             matched by the pattern deleted.

Suppose $0 is /usr/bin/ksh, then ${0%/*} means that the /* is expanded to /ksh - this is the smallest pattern that you can get, and it is deleted. If you had %%/*, it would be the largest match to the pattern, which would mean /usr/bin/ksh (the output would be nothing).
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