That method works for a change to a single file but goes a bit pear-shaped if dealing with multiple files. Consider the following.

[johngg@ovs276 perl]$ ls
abc.txt  def.txt
[johngg@ovs276 perl]$ head -99 *
==> abc.txt <==
test text line 1
test text line 2
test text line 3

==> def.txt <==
test text line 1
test text line 2
test text line 3
[johngg@ovs276 perl]$ perl -i.BAK -pe 'BEGIN { $\ = ",$ARGV[0]\n" } ch
+omp' *.txt
[johngg@ovs276 perl]$ ls
abc.txt      abc.txt.BAK  def.txt      def.txt.BAK
[johngg@ovs276 perl]$ head -99 *
==> abc.txt <==
test text line 1,abc.txt
test text line 2,abc.txt
test text line 3,abc.txt

==> abc.txt.BAK <==
test text line 1
test text line 2
test text line 3

==> def.txt <==
test text line 1,abc.txt
test text line 2,abc.txt
test text line 3,abc.txt

==> def.txt.BAK <==
test text line 1
test text line 2
test text line 3
[johngg@ovs276 perl]$
[johngg@ovs276 perl]$
[johngg@ovs276 perl]$ mv abc.txt.BAK abc.txt
[johngg@ovs276 perl]$ mv def.txt.BAK def.txt
[johngg@ovs276 perl]$ ls
abc.txt  def.txt
[johngg@ovs276 perl]$ head -99 *
==> abc.txt <==
test text line 1
test text line 2
test text line 3

==> def.txt <==
test text line 1
test text line 2
test text line 3
[johngg@ovs276 perl]$ perl -i.BAK -pe 's/$/,$ARGV/;' *.txt
[johngg@ovs276 perl]$ ls
abc.txt      abc.txt.BAK  def.txt      def.txt.BAK
[johngg@ovs276 perl]$ head -99 *
==> abc.txt <==
test text line 1,abc.txt
test text line 2,abc.txt
test text line 3,abc.txt

==> abc.txt.BAK <==
test text line 1
test text line 2
test text line 3

==> def.txt <==
test text line 1,def.txt
test text line 2,def.txt
test text line 3,def.txt

==> def.txt.BAK <==
test text line 1
test text line 2
test text line 3
[johngg@ovs276 perl]$

[download]

Note how with your method the second file (and any subsequent files) is annotated the name of the first file processed, which was in the first element of @ARGV. Have a look at $ARGV vs. @ARGV in perlvar.

Cheers,

JohnGG

In reply to Re^3: How to enter a filename in each line by johngg
in thread How to enter a filename in each line by imran77

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