Update *sum(1)-manpages and mark them as finished and audited

Now that -c behaves correctly, the tools are pretty much done.
Only the manpages were not clear enough what happens when you
specify the c-flag.
This is fixed now.

README

@@ -42,7 +42,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =*  logger          yes                          none
 =*  logname         yes                          none
 =   ls              no                           (-C), -S, -f, -m, -s, -x
-=*  md5sum          non-posix                    none
+=*| md5sum          non-posix                    none
 =*  mkdir           yes                          none
 =*  mkfifo          yes                          none
 =*  mktemp          non-posix                    none
@@ -61,9 +61,9 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 #   sed
     seq             non-posix                    none
 =*  setsid          non-posix                    none
-=   sha1sum         non-posix                    none
+=*| sha1sum         non-posix                    none
-=   sha256sum       non-posix                    none
+=*| sha256sum       non-posix                    none
-=   sha512sum       non-posix                    none
+=*| sha512sum       non-posix                    none
 =*| sleep           yes                          none
     sort            no                           -m, -o, -d, -f, -i
 =*  split           yes                          none

md5sum.1

@@ -1,16 +1,16 @@
-.Dd January 31, 2015
+.Dd March 1, 2015
 .Dt MD5SUM 1
 .Os sbase
 .Sh NAME
 .Nm md5sum
-.Nd compute or check MD5 checksums
+.Nd compute or check MD5 message digests
 .Sh SYNOPSIS
 .Nm
 .Op Fl c
 .Op Ar file ...
 .Sh DESCRIPTION
 .Nm
-writes an MD5 (128-bit) checksum of each
+writes MD5 (128-bit) checksums of each
 .Ar file
 to stdout.
 If no
@@ -24,4 +24,9 @@ reads from stdin.
 Read list of MD5 checksums from each
 .Ar file
 and check them.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .El

sha1sum.1

@@ -1,17 +1,32 @@
-.Dd January 30, 2015
+.Dd March 1, 2015
 .Dt SHA1SUM 1
 .Os sbase
 .Sh NAME
 .Nm sha1sum
-.Nd compute SHA-1 message digest
+.Nd compute or check SHA-1 message digests
 .Sh SYNOPSIS
 .Nm
 .Op Fl c
 .Op Ar file ...
 .Sh DESCRIPTION
-Print SHA-1 (160-bit) checksums. With no file, read standard input.
+.Nm
+writes SHA-1 (160-bit) checksums of each
+.Ar file
+to stdout.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .Sh OPTIONS
 .Bl -tag -width Ds
 .It Fl c
-Read list of SHA1 checksums from file and check them.
+Read list of SHA-1 checksums from each
+.Ar file
+and check them.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .El

sha256sum.1

@@ -1,17 +1,32 @@
-.Dd January 30, 2015
+.Dd March 1, 2015
 .Dt SHA256SUM 1
 .Os sbase
 .Sh NAME
 .Nm sha256sum
-.Nd compute SHA256 message digest
+.Nd compute or check SHA-256 message digests
 .Sh SYNOPSIS
 .Nm
 .Op Fl c
 .Op Ar file ...
 .Sh DESCRIPTION
-Print SHA256 (256-bit) checksums. With no file, read standard input.
+.Nm
+writes SHA-256 (256-bit) checksums of each
+.Ar file
+to stdout.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .Sh OPTIONS
 .Bl -tag -width Ds
 .It Fl c
-Read list of SHA256 checksums from file and check them.
+Read list of SHA-256 checksums from each
+.Ar file
+and check them.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .El

sha512sum.1

@@ -1,17 +1,32 @@
-.Dd January 30, 2015
+.Dd March 1, 2015
 .Dt SHA512SUM 1
 .Os sbase
 .Sh NAME
 .Nm sha512sum
-.Nd compute SHA512 message digest
+.Nd compute or check SHA-512 message digests
 .Sh SYNOPSIS
 .Nm
 .Op Fl c
 .Op Ar file ...
 .Sh DESCRIPTION
-Print SHA512 (512-bit) checksums. With no file, read standard input.
+.Nm
+writes SHA-512 (512-bit) checksums of each
+.Ar file
+to stdout.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .Sh OPTIONS
 .Bl -tag -width Ds
 .It Fl c
-Read list of SHA512 checksums from file and check them.
+Read list of SHA-512 checksums from each
+.Ar file
+and check them.
+If no
+.Ar file
+is given
+.Nm
+reads from stdin.
 .El