Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Re^2: One-liner only checking the first line of the input file

by TJCooper (Beadle)
on Nov 11, 2015 at 14:30 UTC ( #1147454=note: print w/replies, xml ) Need Help??


in reply to Re: One-liner only checking the first line of the input file
in thread One-liner only checking the first line of the input file

perl -lane 'print $_; exit;' input.txt > output.txt

Output.txt appears identical to the input file - all lines are printed.

Replies are listed 'Best First'.
Re^3: One-liner only checking the first line of the input file
by stevieb (Canon) on Nov 11, 2015 at 14:41 UTC

    Do this:

    perl -anE '/(\R)/; say unpack("H*", $1);' input.txt

    It appears as your file is being read as one long string. If you're on *nix, your output should be 0a per line for as many lines you have in the file. Post what the output shows.

      Outputs 0d only once.

        That's a MacOS line ending \r, aka a carriage return. See if this works:

        perl -012 -lane 'print "$F[2]\t$F[7]" if $F[7] > 0' < input.txt

        The -0 flag sets the input record separator (line ending) to \r in octal form.

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://1147454]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (3)
As of 2021-10-20 06:50 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My first memorable Perl project was:







    Results (79 votes). Check out past polls.

    Notices?