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BEGIN {
out_file = "junk2"
print "line 1" >out_file
print "line 2" >out_file
}

Use Awk:

BEGIN { FS="\034"; RS="\035"; OFS="," }
{ gsub( /\n/, "" )
$1=$1
# If last field is empty, remove it.
if ( ""==$NF ) NF--
print
}