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HOW2DEMO.TXT
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1994-03-15
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How to Demo Hamilton C shell
To set up the Hamilton C shell demo, first install it just as
described in the manual on pages 11 and 12, including setting up
the environmental variables (HOME, PATH, COLORS, TABS, ADDITIONS,
etc.) in the control panel as shown in the manual.
A good demonstration might go as follows. What you type is
shown in Courier Bold, machine responses are in Courier and my
comments are in italics.
1 C% cd \hamilton Go to the Hamilton C shell directory
2 C% ls -l List the contents of the directory. Notice
how subdirectories are shown highlighted. The
C shell makes extensive use of color and all
colors are completely user-customizable.
D---- Apr 14 5:00 - bin
D---- Apr 14 5:00 - samples
----- Apr 14 5:00 1712 login.csh
----- Apr 14 5:00 5215 readme
---A- May 20 2:00 31410 readme.too
----- Apr 14 5:00 4369 startup.csh
3 C% ls bin List the bin directory, showing all the
utilities. Notice that all the usual
favorites such as grep, fgrep, head, tail,
etc., are included.
binedit.exe dskread.exe hrm.exe split.exe uniq.exe
cat.exe dskwrite.exe ls.exe strings.exe ver.csh
chmod.exe dt.exe mkdir.exe sum.exe vl.exe
cp.exe du.exe mv.exe tabs.exe wc.exe
csh.exe fgrep.exe newer.exe tail.exe whereis.csh
cut.exe grep.exe older.exe tar.exe xd.exe
des.exe head.exe pwd.exe tee.exe
diff.exe hlabel.exe rmdir.exe touch.exe
dim.exe hmore.exe sed.exe tr.exe
4 C% alias mi It has aliases -- here's an alias for the
more filter, starting it up in interactive
mode (so it'll first clear the screen and
stay around even if it's less than a
screenful.)
mi more -i
5 C% grep -h | mi Everything always has online help with the -h
option.
Regular expression pattern search of text files,
Release 2.1
Usage: grep [-hcilnqsv-] [-f ptrnfile] [ pattern ] [ file1 file2
...]
grep uses special patterns called regular expressions to filter
what it reads from stdin or from any files you specify.
:
--- more --- (Press H for Help) _ Notice we can scroll up and
down with the arrow keys (Do it). And the
more filter itself has online help by
pressing H. (Press H to show it, then press
any key to exit the help screen, followed
by Q or ESC to get out.)
6 C% time factor 12341234 The C shell is a powerful scripting
language. Here's an example, factoring a large
number. Notice that we can time any command
to see how long it takes.
2
73
137
617
0:00:01.37
7 C% whereis factor This is actually a C shell script. We can
find it with the whereis command.
c:\hamilton\samples\factor.csh
8 C% mi `!!` (Note that this is typed with BACKQUOTES,
located next to the numeric one.) Let's
go browse it. Here, the !! (pronounced
bang-bang) part means pick up the text of
the previous command (the whereis factor).
The backquotes mean run what's inside there
and paste the output (the
c:\hamilton\samples\whereis.csh result) back
onto the command line. That's called
command substitution, passing the filename
as an argument to mi, which we saw was the
alias for more. So what we'll do is browse
that script.
proc factor(n) Notice that this C shell has procedures,
if (n > 3) then
for i = 2 to floor(sqrt(n)) do a genuine numeric for
loop, built-in functions
like floor and square root,
if (n % i == 0) then
echo $i
return factor(n//i) and procedures can even be
recursive. Not surprisingly,
a lot of customers are using
Hamilton C shell with thousands
of lines of scripts. For
example, Sybase uses it to
run the build for SQL Server,
Microsoft's languages group
uses it to run nightly regression
tests, etc.
end
end
end
return n
end
:
9 C% echo \<Ctrl-D> Finally, the C shell has a lot of "creature
comforts" such as filename completion and
command line editing. Here, e.g., we'll
expand in-place all the names of the files
in the root. So for folks coming from
a UNIX background -- or anyone looking simply
for a more powerful scripting or development
environment, Hamilton C shell can be very
attractive, offering instant productivity
gains.