s/UNIX/Unix/, when not used as part of a trademark,

for consistency with majority usage in pages.

man2/bind.2

@@ -174,7 +174,7 @@ The socket is already bound to an address.
 .I sockfd
 is a descriptor for a file, not a socket.
 .PP
-The following errors are specific to UNIX domain
+The following errors are specific to Unix domain
 .RB ( AF_UNIX )
 sockets:
 .TP

man2/gethostid.2

@@ -47,7 +47,7 @@ _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\ <\ 500)
 .ad b
 .SH DESCRIPTION
 Get or set a unique 32-bit identifier for the current machine.
-The 32-bit identifier is intended to be unique among all UNIX systems in
+The 32-bit identifier is intended to be unique among all Unix systems in
 existence.
 This normally resembles the Internet address for the local
 machine, as returned by

man2/read.2

@@ -150,7 +150,7 @@ leave st_atime (last file access time)
 updates to the server and client side reads satisfied from the
 client's cache will not cause st_atime updates on the server as there are no
 server side reads.
-UNIX semantics can be obtained by disabling client
+Unix semantics can be obtained by disabling client
 side attribute caching, but in most situations this will substantially
 increase server load and decrease performance.
 .PP

man3/fseek.3

@@ -110,7 +110,7 @@ and
 setting and storing the current value of the file offset into or from the
 object referenced by
 .IR pos .
-On some non-UNIX systems an
+On some non-Unix systems an
 .I fpos_t
 object may be a complex object and these routines may be the only way to
 portably reposition a text stream.

man3/insque.3

@@ -89,7 +89,7 @@ is defined before
 including \fI<search.h>\fP.
 
 The location of the prototypes for these functions differs among several
-versions of UNIX.
+versions of Unix.
 The above is the POSIX version.
 Some systems place them in \fI<string.h>\fP.
 Linux libc4,5 placed them

man3/rpc.3

@@ -1007,7 +1007,7 @@ RPC-style messages without using the RPC package.
 .BI "bool_t xdr_authunix_parms(XDR *" xdrs ", struct authunix_parms *" aupp );
 .fi
 .IP
-Used for describing UNIX credentials.
+Used for describing Unix credentials.
 This routine is useful for users
 who wish to generate these credentials without using the RPC
 authentication package.

man5/filesystems.5

@@ -140,7 +140,7 @@ Linux also supports the System Use Sharing Protocol records specified
 by the Rock Ridge Interchange Protocol.
 They are used to further describe the files in the
 .B iso9660
-file system to a UNIX host, and provide information such as long
+file system to a Unix host, and provide information such as long
 filenames, UID/GID, POSIX permissions, and devices.
 It is automatically recognized within the
 .B iso9660

man5/hosts.5

@@ -55,7 +55,7 @@ shorter hostnames, or generic hostnames (for example,
 .IR localhost ).
 .PP
 The Berkeley Internet Name Domain (BIND) Server implements the
-Internet name server for UNIX systems.
+Internet name server for Unix systems.
 It augments or replaces the
 .I /etc/hosts
 file or hostname lookup, and frees a host from relying on

man5/proc.5

@@ -246,7 +246,7 @@ and you have a working filter.
 .I /proc/self/fd/N
 is approximately the same as
 .I /dev/fd/N
-in some UNIX and UNIX-like systems.
+in some Unix and Unix-like systems.
 Most Linux MAKEDEV scripts symbolically link
 .I /dev/fd
 to
@@ -1463,7 +1463,7 @@ sl  local_address rem_address   st tx_queue rx_queue tr rexmits  tm\->when uid
 .fi
 .TP
 .I /proc/net/unix
-Lists the UNIX domain sockets present within the system and their
+Lists the Unix domain sockets present within the system and their
 status.
 The format is:
 .nf

man7/suffixes.7

@@ -273,7 +273,7 @@ Suffix	File type
  rc	startup (`run control') file, e.g., \fI.newsrc\fP
 .TE
 .SH "CONFORMING TO"
-General UNIX conventions.
+General Unix conventions.
 .SH BUGS
 This list is not exhaustive.
 .SH "SEE ALSO"

man7/utf-8.7

@@ -42,7 +42,7 @@ Such strings can contain as
 parts of many 16-bit characters bytes
 like \(aq\\0\(aq or \(aq/\(aq which have a
 special meaning in filenames and other C library function parameters.
-In addition, the majority of UNIX tools expects ASCII files and can't
+In addition, the majority of Unix tools expects ASCII files and can't
 read 16-bit words as characters without major modifications.
 For these reasons,
 .B UCS-2