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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 DEBIAN

g_principal

g_principal(1)					 GROMACS suite, VERSION 4.5.4-dev-20110404-bc5695c				    g_principal(1)

NAME

       g_principal - calculates axes of inertia for a group of atoms

       VERSION 4.5.4-dev-20110404-bc5695c

SYNOPSIS

       g_principal  -f	traj.xtc  -s topol.tpr -n index.ndx -a1 axis1.dat -a2 axis2.dat -a3 axis3.dat -om moi.dat -[no]h -[no]version -nice int -b
       time -e time -dt time -tu enum -[no]w -[no]foo

DESCRIPTION

	g_principal calculates the three principal axes of inertia for a group of atoms.

FILES

       -f traj.xtc Input
	Trajectory: xtc trr trj gro g96 pdb cpt

       -s topol.tpr Input
	Structure+mass(db): tpr tpb tpa gro g96 pdb

       -n index.ndx Input, Opt.
	Index file

       -a1 axis1.dat Output
	Generic data file

       -a2 axis2.dat Output
	Generic data file

       -a3 axis3.dat Output
	Generic data file

       -om moi.dat Output
	Generic data file

OTHER OPTIONS

       -[no]hno
	Print help info and quit

       -[no]versionno
	Print version info and quit

       -nice int 19
	Set the nicelevel

       -b time 0
	First frame (ps) to read from trajectory

       -e time 0
	Last frame (ps) to read from trajectory

       -dt time 0
	Only use frame when t MOD dt = first time (ps)

       -tu enum ps
	Time unit:  fs,  ps,  ns,  us,	ms or  s

       -[no]wno
	View output  .xvg,  .xpm,  .eps and  .pdb files

       -[no]foono
	Dummy option to avoid empty array

SEE ALSO

       gromacs(7)

       More information about GROMACS is available at <http://www.gromacs.org/>.

								  Mon 4 Apr 2011						    g_principal(1)
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