MCS man page on SmartOS

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MCS(1)									MCS(1)

       mcs - manipulate the comment section of an object file

       mcs [-cdpVz] [-a string] [-n name] file...

       The  mcs	 command is used to manipulate a section, by default the .com‐
       ment 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 con‐
       tained within a segment.

       If the input file is an	archive	 (see  ar.h(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.

       For  operations	other than delete, if the object does not already con‐
       tain a section with the specified name, mcs will	 create	 a  new	 empty
       section with that name before performing the specified operation.

       The following options are supported:

       -a string
		    Appends  string  to	 the comment section of the ELF object
		    files. If string contains  embedded	 blanks,  it  must  be
		    enclosed in quotation marks.

		    Compresses	the contents of the comment section of the ELF
		    object files.  All	duplicate  entries  are	 removed.  The
		    ordering of the remaining entries is not disturbed.

		    Deletes the contents of the specified section from the ELF
		    object files.  The section header for the comment  section
		    is also removed.

       -n name
		    Specifies  the name of the section to access if other than
		    .comment. By default, mcs deals  with  the	section	 named
		    .comment.  This option can be used to specify another sec‐
		    tion. mcs can take multiple -n options to allow for speci‐
		    fication of	 multiple sections.

		    Prints the contents of the comment section on the standard
		    output. Each section printed is tagged by the name of  the
		    file  from	which  it  was	extracted,  using  the	format
		    file[member_name]: for archive files and file:  for	 other

		    Prints on standard error the version number of mcs.

		    Replaces   any  SHT_PROGBITS  sections  with  zeros	 while
		    retaining the original attributes of the sections.

       Example 1 Printing a file's comment section

       The following entry

	 example% mcs -p elf.file

       prints the comment section of the file elf.file.

       Example 2 Appending a string to a comment section

       The following entry

	 example% mcs -a  xyz elf.file

       appends string xyz to elf.file's comment section.

       Example 3 Stripping a specified non-allocable section

       Although used primarily with comment sections, mcs can operate  on  any
       non-allocable  section. In contrast to the strip command, which removes
       a predefined selection of non-allocable sections, mcs can  be  used  to
       delete a specific section. The following entry

	 example% mcs -d -n .annotate elf.file

       removes the section named .annotate from the file elf.file.

		    temporary files

       See attributes(5) for descriptions of the following attributes:

       │Interface Stability │ Stable	      │

       ar(1),  as(1),  ld(1),  strip(1),  ar.h(3HEAD),	elf(3ELF), tmpnam(3C),
       a.out(4), attributes(5)

       When mcs deletes a section using	 the  -d  option,  it  tries  to  bind
       together sections of type SHT_REL and target sections pointed to by the
       sh_info section header field. If one is to be deleted, mcs attempts  to
       delete the other of the pair.

       By using the -z option, it is possible to make an object file by remov‐
       ing the contents of SHT_PROGBITS sections while	retaining  the	object
       file's  original	 structure  as an ELF file. The need for use of the -z
       option is limited. However, the option can be used to deliver an object
       file when the contents of SHT_PROGBITS sections are not relevant.

				  Oct 5, 2007				MCS(1)

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