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Full Discussion: Script reading needed
Top Forums UNIX for Dummies Questions & Answers Script reading needed Post 302848013 by jefferj54 on Wednesday 28th of August 2013 09:53:16 AM
Old 08-28-2013
Script reading needed

Hi,
I'm just learning so I would appreciate some understanding line by line on the while loop/case script below.

Thanks so much.

joe.

Code:
echo "Good Morning."
echo "Enter 1 to Add"
echo "or q to quit."
while [ "$Enter" != "q" ]
do
   read Enter
   case $Enter in
      1) echo "Addtion:"
         echo "Enter a number"
         read num1
         echo "Enter another number"
         read num2
         sum=$((num1 + num2))
         echo "sum=$sum."
         ;;
      q) exit;;
   esac
   echo "Enter another or q to quit"
done


Last edited by vbe; 08-28-2013 at 10:57 AM.. Reason: code tags - indents
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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