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Hello Group,

I am new to learning Perl and am struggling with a syntex encountered
in the code. It looks like

< a.txt b.pl > signature

My question is

what does the first character (<) mean.

What b.pl is doing with a.txt.

I guess the output of the program goes to signature.

BTW: The line I mentioned was in a bash script file.

Can someone help.

Thanks.

nagrik

On Mar 20, 12:07 pm, Nagrik <vnag...@gmail.com> wrote:
> Hello Group,
>
> I am new to learning Perl and am struggling with a syntex encountered
> in the code. It looks like
>
> < a.txt b.pl > signature
>
> My question is
>
> what does the first character (<) mean.
>
> What b.pl is doing with a.txt.
>
> I guess the output of the program goes to signature.
>
> BTW: The line I mentioned was in a bash script file.
>
> Can someone help.
>
> Thanks.
>
> nagrik


< and > are redirection operators. The line you quote can be
translated as follows:

Get the input (<) from the file named 'a.txt', run the script named
'b.pl', and write the output (>) to the file named 'signature'.

CC

ccc31807 wrote:
> On Mar 20, 12:07 pm, Nagrik <vnag...@gmail.com> wrote:
>> Hello Group,
>>
>> I am new to learning Perl and am struggling with a syntex encountered
>> in the code. It looks like
>>
>> < a.txt b.pl > signature
>>
>> My question is
>>
>> what does the first character (<) mean.
>>
>> What b.pl is doing with a.txt.
>>
>> I guess the output of the program goes to signature.
>>
>> BTW: The line I mentioned was in a bash script file.
>>
>> Can someone help.
>>
>> Thanks.
>>
>> nagrik
>
>
> < and > are redirection operators. The line you quote can be
> translated as follows:
>
> Get the input (<) from the file named 'a.txt', run the script named
> 'b.pl', and write the output (>) to the file named 'signature'.

but that's not perl, BTW

hth
t

On Mar 20, 9:18*am, Tony Curtis <tony_curti...@yahoo.com> wrote:
> ccc31807 wrote:
> > On Mar 20, 12:07 pm, Nagrik <vnag...@gmail.com> wrote:
> >> Hello Group,
>
> >> I am new to learning Perl and am struggling with a syntex encountered
> >> in the code. *It looks like
>
> >> < a.txt b.pl > signature
>
> >> My question is
>
> >> what does the first character (<) mean.
>
> >> What b.pl is doing with a.txt.
>
> >> I guess the output of the program goes to signature.
>
> >> BTW: The line I mentioned was in a bash script file.
>
> >> Can someone help.
>
> >> Thanks.
>
> >> nagrik
>
> > < and > are redirection operators. The line you quote can be
> > translated as follows:
>
> > Get the input (<) from the file named 'a.txt', run the script named
> > 'b.pl', and write the output (>) to the file named 'signature'.
>
> but that's not perl, BTW
>
> hth
> t- Hide quoted text -
>
> - Show quoted text -

As I said earlier this line was written in a bash script, and looks
like reading a file inside a perl script and then outputing it.

nagrik

Vinay Nagrik wrote:
> On Mar 20, 9:18 am, Tony Curtis <tony_curti...@yahoo.com> wrote:
>> ccc31807 wrote:
>>> On Mar 20, 12:07 pm, Nagrik <vnag...@gmail.com> wrote:
>>>> Hello Group,
>>>> I am new to learning Perl and am struggling with a syntex encountered
>>>> in the code. It looks like
>>>> < a.txt b.pl > signature
>>>> My question is
>>>> what does the first character (<) mean.
>>>> What b.pl is doing with a.txt.
>>>> I guess the output of the program goes to signature.
>>>> BTW: The line I mentioned was in a bash script file.
>>>> Can someone help.
>>>> Thanks.
>>>> nagrik
>>> < and > are redirection operators. The line you quote can be
>>> translated as follows:
>>> Get the input (<) from the file named 'a.txt', run the script named
>>> 'b.pl', and write the output (>) to the file named 'signature'.
>> but that's not perl, BTW
>>
>> hth

> As I said earlier this line was written in a bash script, and looks
> like reading a file inside a perl script and then outputing it.

As Tony said earlier, "that's not perl". Or more bluntly, the
redirection operators in a bash script have nothing at all to
do with perl, so why are you asking in this newsgroup?

Ask what it does in a bash newsgroup or experiment with it on your
own. Hint: run it with a made up file name, instead of one that
exists.

< dummy b.pl > signature

Nagrik <> wrote:
>I am new to learning Perl and am struggling with a syntex encountered
>in the code. It looks like
>
>< a.txt b.pl > signature
>
>My question is
>
>what does the first character (<) mean.

That depends on the context. Could be a "smaller than" comparision. Could be
the input operator. Could probably be several more things.

>What b.pl is doing with a.txt.

Nothing? At least nothing that could be determined without context. As far
as Perl is concerned that code snippet is a syntax error.

>I guess the output of the program goes to signature.

Well, it could also be a "larger than" comparison or the closing bracket of
input operator or ...

>BTW: The line I mentioned was in a bash script file.

Oh, you weren't talking about Perl? Then why didn't you say so in the first
place?

>Can someone help.

What about the guys over in the bash scripting NG?

jue