Adding some utilities.

Thanks "Galos, David" <galosd83@students.rowan.edu>!

Makefile

@@ -22,8 +22,10 @@ LIB = \
 SRC = \
 	basename.c \
 	cat.c      \
+	chgrp.c    \
 	chmod.c    \
 	chown.c    \
+	chvt.c     \
 	cksum.c    \
 	cmp.c      \
 	cp.c       \
@@ -45,10 +47,13 @@ SRC = \
 	nl.c       \
 	nohup.c    \
 	paste.c    \
+	printenv.c \
 	pwd.c      \
 	rm.c       \
+	rmdir.c    \
 	sleep.c    \
 	sort.c     \
+	sync.c     \
 	tail.c     \
 	tee.c      \
 	test.c     \
@@ -57,6 +62,7 @@ SRC = \
 	tty.c      \
 	uname.c    \
 	uniq.c     \
+	unlink.c   \
 	seq.c      \
 	wc.c       \
 	yes.c

TODO

@@ -1,9 +1,5 @@
 cal [-1] [-3] [-y] [year]
 
-chgrp [-R] groupname file...
-
-chvt N
-
 comm [-123] file1 file2
 
 cut [-bcfs] [-d delim] list [file...]
@@ -26,33 +22,23 @@ id [-ruGgn] username
 
 md5sum [-c] [file...]
 
-nice [-n N] [command]
-
-printenv [variable...]
-
 printf [format] [data...]
 
 printf format [argument...]
 
 readlink [-fem] file
 
-rmdir [directory...]
-
 seq [-s string] [N [N]] N
 
 sha1sum [-c] [file...]
 
 split [-a N] [-b N] [-l N] [input [prefix]]
 
-sync
-
 test [expression...]
 
 tr string1 [string2]
 
 unexpand [-a] [-t N] [file...]
 
-unlink file
-
 who 
 

chgrp.1

@@ -0,0 +1,22 @@
+.TH CHGRP 1 sbase\-VERSION
+.SH NAME
+nice \- invoke a utility with an altered nice value
+.SH SYNOPSIS
+.B chgrp
+.RB [ \-R ]
+.I groupname
+.I file...
+.SH DESCRIPTION
+.B chgrp
+sets the group id of the files specified by 
+.IR file
+to the gid of the group named
+.IR group.
+If the 
+.IR R
+flag is specified, this process is recursively applied to 
+everything in
+.IR file.
+
+.SH SEE ALSO
+.IR chown (1) chown (2) chmod (1) chmod (2) getgrnam (3)

chvt.1

@@ -0,0 +1,11 @@
+.TH CHVT 1 sbase\-VERSION
+.SH NAME
+chvt \- change foreground virtual terminal
+.SH SYNOPSIS
+.B chvt
+.I N
+.SH DESCRIPTION
+.B chvt
+brings /dev/ttyN to the foreground. This has the 
+same effect as Ctrl-Alt-FN.
+

nice.1

@@ -0,0 +1,18 @@
+.TH NICE 1 sbase\-VERSION
+.SH NAME
+nice \- invoke a utility with an altered nice value
+.SH SYNOPSIS
+.B nice
+.RB [ \-n inc ]
+.I command
+.RI [ options ...]
+.SH DESCRIPTION
+.B nice
+invokes
+.IR command
+with a nice value equal to the current nice value plus 
+.IR inc, 
+which defaults to 10 if unspecified.
+
+.SH SEE ALSO
+.IR renice (1) nice (2) 

printenv.1

@@ -0,0 +1,19 @@
+.TH PRINTENV 1 sbase\-VERSION
+.SH NAME
+printenv \- print out the environment or the values of specific variables.
+.SH SYNOPSIS
+.B printenv
+.RB [ var... ]
+.SH DESCRIPTION
+.B printenv
+prints the entire environment as key=values pairs when
+no 
+.IR var
+is specified. Otherwise, in the order specified, 
+.B printenv
+prints the value only of each
+.IR var, 
+one per line.
+
+.SH SEE ALSO
+.IR env (1)

rmdir.1

@@ -0,0 +1,25 @@
+.TH RMDIR  1 sbase\-VERSION
+.SH NAME
+rmdir \- remove a directory
+.SH SYNOPSIS
+.B rmdir
+.I directory...
+.SH DESCRIPTION
+.B rmdir
+attempts to remove all non-full directories specified
+by
+.IR directory.
+.SH BUGS
+Subdirectories are removed in the order specified, so
+.nf
+	rmdir foo/bar foo
+.fi
+will be successful, but
+.nf
+	rmdir foo foo/bar
+.fi
+will only succeed in removing 
+.BR foo/bar.
+
+.SH SEE ALSO
+.IR rm (1) rmdir (2) unlink (1) unlink (2) 

sync.1

@@ -0,0 +1,14 @@
+.TH SYNC 1 sbase\-VERSION
+.SH NAME
+sync \- flush disk cache 
+.SH SYNOPSIS
+.B sync
+.SH DESCRIPTION
+.B sync
+invokes 
+.IR sync(2) 
+to flush all unwritten changes to the disk. This is 
+usually done before shutting down, rebooting or halting.
+
+.SH SEE ALSO
+.IR sync (2)  fsync (2)

unlink.1

@@ -0,0 +1,16 @@
+.TH UNLINK 1 sbase\-VERSION
+.SH NAME
+unlink \- call the unlink function
+.SH SYNOPSIS
+.B unlink
+.RB file
+.SH DESCRIPTION
+.B unlink
+calls the 
+.IR unlink
+function on
+.IR file.
+
+
+.SH SEE ALSO
+.IR unlink (2)