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Full Discussion: CSH Calculator Script
Top Forums Shell Programming and Scripting CSH Calculator Script Post 302925208 by Don Cragun on Friday 14th of November 2014 01:46:06 PM
Old 11-14-2014
I generally refuse to use csh and its derivatives for reasons already mentioned in this thread... But, I think you want to change:
Code:
else if ( $2 =~ "times" ) then
        @ c = $1 * $3
        echo "The product is: $c"

else if ( ( $2 !~ "plus" || $2 !~ "minus" ) && ( $2 !~ "div" || $2 !~ "times" ) ) then
        echo "You have entered an invalid operation"

else
        echo "You are missing an operand or operator"
endif

to something like:
Code:
else if ( $2 =~ "times" ) then
        @ c = $1 * $3
        echo "The product is: $c"

else    echo "You have entered an invalid operation"
        exit 2
endif

and I think you want to add something like:

Code:
if ( $# < 3 ) then
        echo "You are missing an operand or operator"
        exit 1
endif

before the code you showed us. I have not tested any of these suggestions, but they should get you a little bit closer to what you're trying to do.

If you want to learn about UNIX and Linux (and BSD) system shell programming, I strongly suggest you get a different book that describes ksh, bash, or some other shell that is based on Bourne shell syntax.

Good luck.
This User Gave Thanks to Don Cragun For This Post:
 

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-f] [-q] [-t] [file] DESCRIPTION
Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a Append the output to file or typescript, retaining the prior contents. -f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super- vise real-time what is being done using `cat foo'. -q Be quiet. -t Output timeing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), replay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. Linux July 30, 2000 Linux
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