LinuxQuestions.org - [SOLVED] Stuck on join command from book

Hello,

Going through book, "Guide to UNIX Using Linux". I am doing one of the projects that has me writing scripts to join files. Here is my pnumname script and I am extracting the programmers names and numbers from the program file and redirecting the output to the file pnn. I then created a joinall script where I am trying to join the files pnn and pnumname and redirect the output to pactrep. When I run the script sh joinall and use less to display the contents of the redirected file pactrep, I get an error- join: extra operand `pnum'
Try `join --help' for more information.... I went to the man pages but I still (obvious) do not have a solid grasp. Thanks for the help in advance.

#=======================================================
# Script Name: pnumname
# By: J.D.
# Date: February 2011
# Purpose: Extract Programmer Numbers and Names
#=======================================================
cut -d: -f1-4 programmer | sort -t: -k 1 | uniq > pnn
# The above cuts out fields 1 through 4.
# The output is piped to a sort by programmer number.
# The sorted output is piped to uniq to remove
# duplicates.
# Uniq redirects the output to pnn.

output file pnn results...

cat pnn
101:Johnson:John:K
102:King:Mary:K
103:Brown:Gretchen:K
104:Adams:Betty:C
105:Utley:Amos:V
106:Wilson:Patricia:B
107:Culligan:Thomas:F
108:Mitchell:Hillary:N
109:Arbuckle:Margaret:F
110:Ford:Terrence:H
111:Greene:Sarah:L
112:Rose:Richard:P
113:Daniels:Allan:S
114:Edwards:George:J

joinall script

#=========================================================
# Script Name: joinall
# By: J.D.
# Date: February 2011
# Purpose: Join pnum and pnn to create a report file
#==========================================================
# Join the file including the unassigned programmers.
# You do this by placing the programmer names (pnn) file,
# forst, in the join sequence.
#==========================================================
join -t: a1 -j1 1 -j2 1 pnn pnum > pactrep