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Homework and Emergencies Homework & Coursework Questions Problem with calculator script Post 302478913 by R0H0N on Thursday 9th of December 2010 07:14:04 AM
Old 12-09-2010
Quote:
Originally Posted by zkapopou
Thanks for the help, but that's not allowed.

Has to be in the form

mymath.sh [-options] [-args]

Valid examples:

mymath.sh -a 12 39
mymath.sh -m -d 44 17
mymath.sh 35 -a -d 88 -m
Ok... Then u have to add below mentioned check conditions in your script.

1.> Make sure that only 3 command line arguments are entered.

Code:
if [ $# -gt 3  ] ; then display usage

2.> Make sure that arguments are entered properly. I mean first argument must be option and other two must be numbers.

Code:
echo $1 | egrep "^[+-][asdmhv]$" | if [ $? -gt 0 ] ; then ; exit ; fi
echo $2 | egrep "^[+-]*[0-9]$" | if [ $? -gt 0 ] ; then ; exit ; fi
echo $3 | egrep "^[+-]*[0-9]$" | if [ $? -gt 0 ] ; then ; exit ; fi

If these conditions are not meet then display usage and simply exit.
R0H0N
 

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ECHO(1) 								FSF								   ECHO(1)

NAME
echo - display a line of text SYNOPSIS
echo [OPTION]... [STRING]... DESCRIPTION
NOTE: your shell may have its own version of echo which will supercede the version described here. Please refer to your shell's documenta- tion for details about the options it supports. Echo the STRING(s) to standard output. -n do not output the trailing newline -e enable interpretation of the backslash-escaped characters listed below -E disable interpretation of those sequences in STRINGs --help display this help and exit --version output version information and exit Without -E, the following sequences are recognized and interpolated: NNN the character whose ASCII code is NNN (octal) \ backslash a alert (BEL)  backspace c suppress trailing newline f form feed new line carriage return horizontal tab v vertical tab AUTHOR
Written by FIXME unknown. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for echo is maintained as a Texinfo manual. If the info and echo programs are properly installed at your site, the command info echo should give you access to the complete manual. GNU coreutils 4.5.3 February 2003 ECHO(1)
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