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mcs(1)                           User Commands                          mcs(1)

       mcs - manipulate the comment section of an object file

       mcs [-cdHpVz] [-a string] [-A file] [-n name] file...

       The  mcs  command is used to display, deduplicate, or append content to
       comment sections in an ELF object file. It can also be used  to  delete
       comment  or  non-comment  sections,  and to zero SHT_PROGBITS sections.
       Unless otherwise specified, the section named .comment is  manipulated.
       mcs  cannot  modify or delete a section that is contained within a seg‐

       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 object
       file  in the archive; if the archive member is not an object file, then
       it is left unchanged.

       mcs must be given one or  more  of  the  options  described  below.  It
       applies each option, in the order given, to each file.

       For append operations, if the object does not already contain a section
       with the specified name, mcs will create a new empty section with  that
       name before performing the append operation.

       The following options are supported:

       -a string    Appends string to the comment section of the object files.

       -A file      Appends the contents of the given file to the comment sec‐
                    tion of the object files.

       -c           Compresses the contents of  the  comment  section  of  the
                    object  files  by deduplication. All duplicate entries are
                    removed. The ordering of the remaining entries is not dis‐

       -d           Deletes the specified section from the object files.

       -H           When  -p  is  used, suppress the output of the name of the
                    file, as well as any blank lines normally inserted between
                    the output for each file.

       -n name      Specifies  the name of the section to access if other than
                    .comment. By default, mcs deals  with  the  section  named
                    .comment.  mcs  can  take multiple -n options to allow for
                    specification of multiple sections. mcs assumes  that  any
                    sections  it manipulates have the format of a comment sec‐

       -p           Prints the contents of the comment section on the standard
                    output.  Unless used with -H, each section printed is pre‐
                    fixed with  the  name  of  the  file  from  which  it  was
                    extracted, using the format file[member_name]: for archive
                    files and file: for other files.

       -V           Print version information.

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

       -?           Print usage message and immediately exit.

       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.

       /tmp/mcs_*    temporary files

       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Availabilitydeveloper/base-developer-utilities _ Inter‐
       face StabilityCommitted

       ar(1), as(1), elfcompress(1), ld(1), strip(1), elf(3ELF),  ar.h(3HEAD),
       a.out(5), attributes(7)

       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.

       The -z option removes  the  contents  of  SHT_PROGBITS  sections  while
       retaining the original ELF structure of the object. 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 rele‐

       The mcs command is unable to modify core files.

Oracle Solaris 11.4             6 January 2020                          mcs(1)
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