makeworld中一条mergemaster命令不懂的地方？

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请问这命令怎么解释，特别是括号的解释。thanks!
/usr/sbin/mergemaster -p -v -w 132 (eliminate '-w 132' if 132x43 video mode is not activated)

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请问这命令怎么解释，特别是括号的解释。thanks!
/usr/sbin/mergemaster -p -v -w 132 (eliminate '-w 132' if 132x43 video mode is not activated)

-pre-buildworld mode.  Compares only files known to be essen-tial     to the success of {build|install}world, including/etc/make.conf.


-v :Be more verbose about the process.  You should probably use this option the first time you run mergemaster.  This option also gives you a list of files that exist only in the installed version of /etc.

-w N:Supply an alternate screen width to the sdiff(1) command in numbers of columns.  The default is 80.