[ILUG] scripting question

[Keith Gaughan]

luker_luker wrote:

> Try Tcsh  then, if you like c syntax.

...and don't mind your shell being horribly broken:

    http://www.grymoire.com/Unix/CshTop10.txt

> On Thu, Feb 17, 2011 at 11:53 AM, Conor Wynne <mariconor at gmail.com> wrote:
> 
>> Hi all,
>>
>> When scripting in bash, and using C style syntax, example
>>
>> for (i=0;i<=50;i++)
>>
>> do I have to declare the variable(s) before hand?
>>
>> Compared to :
>>
>> #!/bin/bash
>>
>>        for i in `seq 1 50`;
>>        do
>>                echo $i
>>        done
>>
>> Just wondering.. as I'm more familiar with C than anything else.

No, you don't have to declare variables. They're declared by their
first use, as is being down in the first line of the for-loop. You
won't get an error if you try to dereference a variable (as is happening
in the echo statement) that hasn't already been defined/declared - it'll
dereference to, essentially, nothing: an empty string.

I'd advise you to have a read through the Advanced Bash Scripting Guide[1],
which, in spite of its name, only really assumes you already know how to
program.

You're really better off sticking with a modern sh derivative like bash or
zsh rather than using something like csh.

K.

[1] http://tldp.org/LDP/abs/html/

K.