Whats does this mean


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# 1  
Whats does this mean

Found this piece of code written in ksh. I have no ideas what do the stuff like ${SRF##*\.} do.


SUFFIX=${SRF##*\.}
if [ "$SUFFIX" = "${SRF}" ]; then
SUFFIX=""
fi

I have encountered similar expressions in other programs also. Any pointers on where to learn more about these strange expressions would be really helpful.

Thanks,
JP
# 2  
from man ksh ...
Quote:
${parameter#pattern}
${parameter##pattern}
If the shell pattern matches the beginning of
the value of parameter, the value of this
substitution is the value of the parameter
with the matched portion deleted; otherwise
the value of this parameter substituted. In
the former case, the smallest matching
pattern is deleted; in the latter case, the
largest matching pattern is deleted.

${parameter%pattern}
${parameter%%pattern}
If the shell pattern matches the end of the
value of parameter, the value of parameter
with the matched part is deleted; otherwise
substitute the value of parameter. In the
former, the smallest matching pattern is
deleted; in the latter, the largest matching
pattern is deleted.
Some examples:
Code:
$ SRF="/path/to/file.ext"
$ echo ${SRF##*.}
ext
$ echo ${SRF%%.*}
/path/to/file
$ echo ${SRF##*/}
file.ext
$ echo ${SRF%/*}
/path/to

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