Re^2: 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.

Comment on Re^2: One-liner only checking the first line of the input file Download Code

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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", $1);' input.txt` [download] It appears as your file is being read as one long string. If you're on nix, your output should be `0a` per line for as many lines you have in the file. Post what the output shows.	[reply] [d/l] [select]
Re^4: One-liner only checking the first line of the input file by TJCooper (Beadle) on Nov 11, 2015 at 14:51 UTC
Outputs `0d` only once.	[reply] [d/l]
Re^5: One-liner only checking the first line of the input file by stevieb (Canon) on Nov 11, 2015 at 15:04 UTC
That's a MacOS line ending `\r`, aka a carriage return. See if this works: `perl -012 -lane 'print "$F[2]\t$F[7]" if $F[7] > 0' < input.txt` [download] The `-0` flag sets the input record separator (line ending) to `\r` in octal form.	[reply] [d/l] [select]
Re^6: One-liner only checking the first line of the input file by TJCooper (Beadle) on Nov 11, 2015 at 15:13 UTC
Re^7: One-liner only checking the first line of the input file by stevieb (Canon) on Nov 11, 2015 at 15:18 UTC
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