The mcs command is used to manipulate a section, by default the .comment section, in an ELF object file. It is used to add to, delete, print, and compress the contents of a section in an ELF object
file, and print only the contents of a section in a COFF object file. mcs cannot add, delete, or compress the contents of a section that is contained within a segment.
If the input file is an archive (see ar(3HEAD)), the archive is treated as a set of individual files. For example, if the -a option is specified,
the string is appended to the comment section of each ELF object file in the archive; if the archive member is not an ELF object file, then it is left unchanged.
mcs must be given one or more of the options described below. It applies, in order, each of the specified options to each file.