Re: bash scripts conditionals and substrings

Craig White wrote:

> On Mon, 2005-02-28 at 20:30 -0700, Kevin wrote:
>
>>On Mon, 2005-02-28 at 20:05 -0700, Craig White wrote:
>>

>>>   if ${i:6:5} = "START"
>>>      then printf $i >> $outfile
>>>   else
>>>      printf "if (!function_exists('_prefs_hook_$i')) { \n\n" >>
>>>$outfile

>>>
>>> fi
>>
>>
>>Maybe something like this?
>> if `echo $i | awk '{print substr($i,6,5)}'` = "START"
>>
>>I have not tried it. I'm just guessing. :) But seriously, the
>>substring function of awk (substr) jumped to mind. You might be able to
>>leverage it. I don't have my bash book handy, but there is probably a
>>more elegant way to handle this directly in bash.
>
> ----
> that may be a very good conditional...
>
> but the problem I am having is still the part...
>
> do if `echo $i | awk '{print substr($i,6,5)}'` = "START"
>
> which actually tries to execute the results of the substring function,
> much like my previous example with the substring function I was trying
> to do directly in bash.
>
> there is sort of black art thing to shell scripting that I didn't learn
> and my bash book doesn't impart upon me.

if [ conditions ]
    then
fi

A few things to note, spaces are between the brackets and the conditions so:
if [ conditions ]
will work, but:
if [conditions]
will not work.

Second, = is the assignment variable, == is the test conditional

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