--- David Cary Hart <Fedora@xxxxxxxxxxx> wrote:
> Bash is astonishingly fussy about spacing and
> punctuation.
>
> Here's a (admittedly very inelegant) snippet of code
> to automatically
> generate exploit abuse complaints from a cron job.
>
> while read evil freq ; do
> if [ "$freq" -gt 250 ] ; then
> a=`host $evil`
> c=`expr "$a" : '.*\(\..*\.net\)'`
> evilisp=${c/\./abuse\@}
> if [ $evilisp > "0" ] ; then
> .. . . . .
>
> Note the use of both ' and ` in the line with the
> "expr." I find that
> they are not interchangeable. Assigning a variable
> to an 'expr' will not
> work without the "`". In fact, I cut and pasted it
> from some web docs.
> I'm not even really sure what character it is.
>
> Can someone point me to documentation that fully
> explains this
> punctuation issue? Yes, I know that there are
> alternatives like awk and
> perl but I would like to understand the bash issue.
>
>
>
> --
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http://www.tldp.org/LDP/abs/html/index.html
That's the best BASH site I know if.
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"Never memorize what you can look up." -Albert Einstein
