You're not passing a slash to the shell. Backticks are like "". If you want the resulting string to contain a slash, you need to escape it. 
$ perl -le'print "foo
bar"'
foo
bar

$ perl -le'print "foo\
bar"'
foo
bar

$ perl -le'print "foo\\
bar"'
foo\
bar

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In reply to Re^3: Backtics execution with multiple lines by ikegami
in thread Backtics execution with multiple lines by ivanatora

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