From the perldoc: 

tr/SEARCHLIST/REPLACEMENTLIST/cdsr
y/SEARCHLIST/REPLACEMENTLIST/cdsr

...

Options:

    c Complement the SEARCHLIST.
    d Delete found but unreplaced characters.
    s Squash duplicate replaced characters.
    r Return the modified string and leave the original string
    untouched.

If the /c modifier is specified, the SEARCHLIST character set is compl
+emented.
If the /d modifier is specified, any characters specified by SEARCHLIS
+T not
found in REPLACEMENTLIST are deleted. (Note that this is slightly more
+ flexible
than the behavior of some tr programs, which delete anything they find
+ in the
SEARCHLIST, period.) If the /s modifier is specified, sequences of cha
+racters
that were transliterated to the same character are squashed down to a 
+single
instance of the character.

If the /d modifier is used, the REPLACEMENTLIST is always interpreted 
+exactly as
specified.

[download]
"\n"s are being deleted because they are not specified in the replacement list.

NOTE! the /r option is relatively new and may not be present in your version of Perl. Check your local docs to be sure.

You must always remember that the primary goal is to drain the swamp even when you are hip-deep in alligators.

In reply to Re: Meaning of command by boftx
in thread Meaning of command by grewal7634

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