Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling

Re: input from STDIN or from a file

by naikonta (Curate)
on Jan 28, 2008 at 17:16 UTC ( #664713=note: print w/ replies, xml ) Need Help??

in reply to input from STDIN or from a file

I don't know how complex your program would be, but I usually just use,

$ cat file.txt a b c $ cat #!/usr/bin/perl -l while (<>) { $_ = uc; print; } $ perl file.txt A B C $ cat file.txt | perl A B C
Or, just perl -lpe '$_=uc' if it's really that simple. Anyway, I don't see anything wrong with your code.

Update: Fixed missing -l (only the dash was there). Thanks almut :-)

Open source softwares? Share and enjoy. Make profit from them if you can. Yet, share and enjoy!

Comment on Re: input from STDIN or from a file
Select or Download Code
Replies are listed 'Best First'.
Re^2: input from STDIN or from a file
by almut (Canon) on Jan 28, 2008 at 19:17 UTC
    #!/usr/bin/perl - ^

    I'm not sure you want the dash at the end of the shebang line...

    It doesn't do any harm when invoking the code like you did, but when I try to run your sample code/data without explicitly calling perl (rather letting the OS handle the shebang), I'm getting

    $ cat file.txt | ./ Can't locate object method "a" via package "b" (perhaps you forgot to +load "b"?) at - line 1.

    I suppose this is because what comes in through stdin is being interpreted as Perl code, rather than as content to be read via <> ...

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://664713]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (2)
As of 2015-11-28 07:42 GMT
Find Nodes?
    Voting Booth?

    What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

    Results (739 votes), past polls