If you get error “nothing appropriate” when you try using the man command, it is as a result of the man database not updated
[root@HQDEV1 ~]# man -k copy
copy: nothing appropriate.The man page database needs to be updated, that’s why you get “nothing appropriate”.
To solve the “nothing appropriate” issue, as a root user, run the command
[root@HQDEV1 ~]# mandb
Purging old database entries in /usr/share/man/overrides...
Processing manual pages under /usr/share/man/overrides...
Purging old database entries in /usr/share/man...
Processing manual pages under /usr/share/man...
Purging old database entries in /usr/share/man/overrides...
Processing manual pages under /usr/share/man/overrides...
Purging old database entries in /usr/share/man/ru...
Processing manual pages under /usr/share/man/ru...
The database will be updated, and you can try re running the man command again.
[root@HQDEV1 ~]# man -k copy
bcopy (3) - copy byte sequence
buildah-copy (1) - Copies the contents of a file, URL, or directory into a container's working directory.
copy_file_range (2) - Copy a range of data from one file to another
copysign (3) - copy sign of a number
copysign (3p) - number manipulation function
copysignf (3) - copy sign of a number
copysignl (3) - copy sign of a number
cp (1) - copy files and directories
cp (1p) - copy files
cpio (1) - copy files to and from archives
dd (1) - convert and copy a file
dd (1p) - convert and copy a file
docker-cp (1) - Copy files/folders between a container and the local filesystem
exec (1p) - execute commands and open, close, or copy file descriptors
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