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Shell Programming and Scripting

How to display an error msg?

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Top Forums Shell Programming and Scripting How to display an error msg?
# 1  
Old 10-30-2008
How to display an error msg?
Hi friends,
Please suggest a solution for this.
A script has following things.

echo "Enter P for PML"
echo "Enter V for VVL"
echo "Enter L for LNL"
echo "Enter G for GDL"
read choice
echo ${choice} >> LOG_Daily.txt

if operator enters anything other that P/V/L/G it should show an error msg like "Wrong media Choice; Please try again"

Thanx in advance
Anushree.
# 2  
Old 10-30-2008
echo
echo "1 - Enter P for PML"
echo "2 - Enter V for VVL"
echo "3 - Enter L for LNL"
echo
echo "Select: \c"
read INPUT

case "$INPUT"
in
1) Do some operations for P ;;
2) Do some operations for V ;;
3) Do some operations for L ;;

*) echo "Wrong media Choice Please try again"

;;
esac
# 3  
Old 10-30-2008
Code:
#!/bin/bash

while 1
do
    echo "Enter P for PML"
    echo "Enter V for VVL"
    echo "Enter L for LNL"
    echo "Enter G for GDL"
    read choice
    case $choice in
        [qQ]) break;;
        P) do P stuff;;
        V) do V stuff;;
        L) do L stuff;;
        G) do G stuff;;
        *) echo "Wrong media Choice; Please try again";;
    esac
done

# 4  
Old 10-30-2008
Hey Wempy, when i use your script i am getting an error

tr.sh[3]: 1: not found.

2nd thing, i forgot to mention that this loop should continuw till the operator enters right option.
# 5  
Old 10-30-2008
Hi, yes, er smallish error there replace the "while 1" with "while true". sorry, that was an odd mixture of C and BASH.
shuffles off, muttering I must try harder .....
# 6  
Old 10-30-2008
Its working, thanx for your help buddy, but i think i will come to you again because i m not able to incorporate the script in my old script. Lets see, Will inform u by day end. :-)
# 7  
Old 10-30-2008
Quote:
Originally Posted by wempy
Hi, yes, er smallish error there replace the "while 1" with "while true". sorry, that was an odd mixture of C and BASH.
shuffles off, muttering I must try harder .....
its always a better practice to use
Code:
while :

instead of
Code:
while true
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