The command set datafile commentschars specifies what characters can be used
in a data file to begin comment lines. If the first non-blank character on a
line is one of these characters then the rest of the data line is ignored.
Default value of the string is "#!" on VMS and "#" otherwise.
Syntax:
set datafile commentschars {"<string>"}
show datafile commentschars
unset commentschars
Then, the following line in a data file is completely ignored
# 1 2 3 4
but the following
1 # 3 4
will be interpreted as garbage in the 2nd column followed by valid data in
the 3rd and 4th columns.
Example:
set datafile commentschars "#!%"