1) How many bits of the mode of a file can be changed by chmod?

	12

2) What does it mean if the word OOPS appears on your screen?

	Your program is using termcap(3) wrongly.

3) From tjo: What, according to K&R, is wrong with this piece of C:

	#include <stdio.h>
	main()
	{
		int 	entry;

		entry = 0;
		exit(0);
	}

	"entry" is an unused reserved word.

4) How many in-core inodes are used by a pipe?

	1 in V7 etc. You need 2 pointers into the buffer, for reading and
	writing. An inode only contains one pointer for this purpose, but
	the file length field is used for the other.

	May be 2 on 4.2BSD where pipes are implemented as a pair of sockets
	(grooh!)

5) Why do many C source code files begin with a line containing a single
   # character?

	Because the V6 C compiler only invoked the C preprocessor if
	they did.

6) Give a command line to put the standard output and the standard error
   output from a program called "prog" into two separate files
   a) for the C-shell (csh)
   b) for the Bourne shell (sh)

	a) (prog > out) >& err
	b) prog > out 2> err

7) What difference is there between the *roff commands .so and 'so?

	The soelim command does not process 'so commands.

8) Suggested by mtr from the network news:
   You have 42 files in your working directory called *.pas.
   Rename them to *.px with a single line csh or sh script.

	eval `ls -d *.pas | sed 's/\(.*\).pas/mv \1.pas \1.px;/'`

	works under both sh and csh.

9) What are the relative merits of the two lines:

	find / -name 't#*' -exec rm -f {} \;
	rm -f `find / -name 't#*' -print`

	The second only execs one find and one rm, but may fall over if the
	output of the find command is immense ( >10K in the C-shell, I think)

	The first is less efficient, but does not suffer from this restriction.

10) A large C program (in fact, the run-time system for the occam compiler)
    works fine normally, but goes into an infinite loop if I control-C it.
    It catches all fatal signals so that it can reset the terminal modes
    before exiting.  Suggest a likely reason why it goes bonkers.

	The signal-handling code is causing a signal somehow.

11) What does the "cat" command do?

	No marks for this one - it was in the vein of the question on the
	Civil Service entrance exam one year - "Write down everything you know".
	I would have said "rtfm" or "everything but make the tea".

Results out of 10:
	steve@hlh 8
	cmd	  7.5
	jmh	  5.5
	tjo	  5