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Full Discussion: Perl command line option '-n','-p' and multiple files: can it know a file name of a printed line?
Top Forums Shell Programming and Scripting Perl command line option '-n','-p' and multiple files: can it know a file name of a printed line? Post 302998439 by durden_tyler on Thursday 1st of June 2017 03:18:14 PM
Old 06-01-2017
Also check the eof and eof() functions in the Perl documentation.
The eof function can be used to reset the line number in case multiple files are fed to the perl interpreter.

Code:
 $
$ cat -n file1.dat
     1  Data in line 1 of file file_1.dat
     2  Data in line 2 of file file_1.dat
     3  Data in line 3 of file file_1.dat
     4  Data in line 4 of file file_1.dat
     5  Data in line 5 of file file_1.dat
$
$ cat -n file2.dat
     1  Data in line 1 of file file_2.dat
     2  Data in line 2 of file file_2.dat
     3  Data in line 3 of file file_2.dat
     4  Data in line 4 of file file_2.dat
     5  Data in line 5 of file file_2.dat
$
$ cat -n file3.dat
     1  Data in line 1 of file file_3.dat
     2  Data in line 2 of file file_3.dat
     3  Data in line 3 of file file_3.dat
     4  Data in line 4 of file file_3.dat
     5  Data in line 5 of file file_3.dat
$
$ # $. is not reset by itself. Perl numbers the pseudo-file formed from the files listed on the command line
$ perl -lne 'printf("File = %s, Line = %2d : [%s]\n", $ARGV, $., $_)' file1.dat file2.dat file3.dat
File = file1.dat, Line =  1 : [Data in line 1 of file file_1.dat]
File = file1.dat, Line =  2 : [Data in line 2 of file file_1.dat]
File = file1.dat, Line =  3 : [Data in line 3 of file file_1.dat]
File = file1.dat, Line =  4 : [Data in line 4 of file file_1.dat]
File = file1.dat, Line =  5 : [Data in line 5 of file file_1.dat]
File = file2.dat, Line =  6 : [Data in line 1 of file file_2.dat]
File = file2.dat, Line =  7 : [Data in line 2 of file file_2.dat]
File = file2.dat, Line =  8 : [Data in line 3 of file file_2.dat]
File = file2.dat, Line =  9 : [Data in line 4 of file file_2.dat]
File = file2.dat, Line = 10 : [Data in line 5 of file file_2.dat]
File = file3.dat, Line = 11 : [Data in line 1 of file file_3.dat]
File = file3.dat, Line = 12 : [Data in line 2 of file file_3.dat]
File = file3.dat, Line = 13 : [Data in line 3 of file file_3.dat]
File = file3.dat, Line = 14 : [Data in line 4 of file file_3.dat]
File = file3.dat, Line = 15 : [Data in line 5 of file file_3.dat]
$
$ # $. is reset for each file; similar to awk's FNR == NR idiom
$ perl -lne 'printf("File = %s, Line = %2d : [%s]\n", $ARGV, $., $_); close(ARGV) if eof' file1.dat file2.dat file3.dat
File = file1.dat, Line =  1 : [Data in line 1 of file file_1.dat]
File = file1.dat, Line =  2 : [Data in line 2 of file file_1.dat]
File = file1.dat, Line =  3 : [Data in line 3 of file file_1.dat]
File = file1.dat, Line =  4 : [Data in line 4 of file file_1.dat]
File = file1.dat, Line =  5 : [Data in line 5 of file file_1.dat]
File = file2.dat, Line =  1 : [Data in line 1 of file file_2.dat]
File = file2.dat, Line =  2 : [Data in line 2 of file file_2.dat]
File = file2.dat, Line =  3 : [Data in line 3 of file file_2.dat]
File = file2.dat, Line =  4 : [Data in line 4 of file file_2.dat]
File = file2.dat, Line =  5 : [Data in line 5 of file file_2.dat]
File = file3.dat, Line =  1 : [Data in line 1 of file file_3.dat]
File = file3.dat, Line =  2 : [Data in line 2 of file file_3.dat]
File = file3.dat, Line =  3 : [Data in line 3 of file file_3.dat]
File = file3.dat, Line =  4 : [Data in line 4 of file file_3.dat]
File = file3.dat, Line =  5 : [Data in line 5 of file file_3.dat]
$
$

 

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LEARN ABOUT LINUX

unknown

UNKNOWN(1)						      General Commands Manual							UNKNOWN(1)

NAME

       unknown - identify possible genotypes for unknowns

SYNOPSIS

       A program to rapidly identify which genotypes are possible for individuals typed as unknowns in the input pedigree.

       unknown [ -cl ]

DESCRIPTION

       unknown infers possible genotypes and mating combinations for parents with unknown genotypes for ilink(1), mlink(1) and linkmap(1).

OPTIONS

       -c     Use conditional allele frequencies.

       -l     Choose a good set of loop breakers automatically.

RETURN VALUE

       0     Successful completion

ERRORS

       10    File not found
       255   Failure

EXAMPLES

       Normally, unknown(1) is run immediately prior to its sister programs, ilink(1), mlink(1) and linkmap(1), like this:

       unknown
       mlink

FILES

       unknown(1) reads the two files pedfile.dat and datafile.dat as its own input and produces various temporary files that are used as input to
       the next program. These temporary files are ipedfile.dat, upedfile.dat, speedfile.dat and newspeedfile.dat.

NOTES

       unknown(1) is part of the FASTLINK package, which is a re-implementation of the LINKAGE suite  of  computer  tools  that  help  investigate
       genetic linkage as first proposed G.M. Lathrop, J.M. Lalouel, C. Julier, and J. Ott.

AUTHORS

       Dylan Cooper, Alejandro Schaffer, and Tony Schurtz based on work originally by Jurg Ott, Ph.D, et. al.

       This manual page was written by Elizabeth Barham <lizzy@soggytrousers.net> for the Debian GNU/Linux system (but may be used by others).

WORD-WIDE-WEB
       http://www.ncbi.nlm.nih.gov/CBBResearch/Schaffer/fastlink.html

SEE ALSO

       ilink(1), linkmap(1), lodscore(1), mlink(1).

								  April 15, 2003							UNKNOWN(1)
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