Why can't apropos find cmp? I clearly see both search words on cmp man page. I've tried to run sudo mandb -c just in case with no apprarent changes. I've tried web search, read Why man -k or Apropos cannot find some pages while man -a can? however do not see how it can apply to my case.
$ man cmp
NAME
GNU cmp - compare two files byte by byte
SYNOPSIS
cmp [OPTION]... FILE1 [FILE2 [SKIP1 [SKIP2]]]
DESCRIPTION
Compare two files byte by byte.
But:
~$ man -k files | grep -i compare
bzcmp (1) - compare bzip2 compressed files
bzdiff (1) - compare bzip2 compressed files
comm (1) - compare two sorted files line by line
git-diff-files (1) - Compares files in the working tree and the index
lzcmp (1) - compare compressed files
lzdiff (1) - compare compressed files
mcomp (1) - Compares two files using mtools
ntfscmp (8) - compare two NTFS filesystems and tell the differences
xzcmp (1) - compare compressed files
xzdiff (1) - compare compressed files
zcmp (1) - compare compressed files
zdiff (1) - compare compressed files
~$ apropos -a files compare
bzcmp (1) - compare bzip2 compressed files
bzdiff (1) - compare bzip2 compressed files
comm (1) - compare two sorted files line by line
git-diff-files (1) - Compares files in the working tree and the index
lzcmp (1) - compare compressed files
lzdiff (1) - compare compressed files
mcomp (1) - Compares two files using mtools
ntfscmp (8) - compare two NTFS filesystems and tell the differences
xzcmp (1) - compare compressed files
xzdiff (1) - compare compressed files
zcmp (1) - compare compressed files
zdiff (1) - compare compressed files
