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perl -e 'while (<>) { if (! /\|$/ ) { chomp; } print ;}' input.dat > output.dat

should work assuming the correct end of line is always preceeded with a '|' character.

If you have trailing...

You can check to see if any file has a particular file open using the lsof command.

lsof filename

produces no output if no process has that file open. If you're running on Solaris then you can...