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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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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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