>>What command(s) can I use to see what process(es) are accessing a file
fuser and lsof come to mind.
fuser -u yourfilehere
lsof yourfilehere
Note that lsof is not part of a standard HP-UX install and must be installed separately.
See the fuser and lsof (if installed) man pages for more information.
>>what kind of access they have (read/write, etc)
You would have to see what user started the process that is accessing the file, see what groups that user is a member of and then look at the permissions on the file to determine what can be done.
For example, if the user 'fido' is accessing file /a/b/c/file1 and fido is part of groups grp1 and grp3. Do an 'ls -l' on /a/b/c/file1 and look at the permissions.
Say file1 is:
-rwxrwxr-x 1 user1 grp3 123456 Oct 12 08:03 file1
The file is owned by user1 (who has read, write and exec permission) and the group is grp3 (which also has rwx permission). Since 'fido' is a member of grp3 it can read, write and execute the file.
>>can more than one process access a file?
Absolutely!!!!!! It would be hard to be a multi-user operating without that capability!
