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Script interacts with user , based on user input it operates

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# 1  
Old 11-15-2012
Script interacts with user , based on user input it operates
i have a script which takes input from user, if user gives either Y/y then it should continue, else it should quit by displaying user cancelled.


Code:
 
#!/bin/sh
echo " Enter your choice  to continue y/Y  OR n/N to quit "
read A
if [ "$A" = "y" || "$A" = "Y" ]
then
echo " user requested to continue "
##some commands
else
echo " User requested to cancel"
exit 1
fi
exit 0

above code is throwing error, please suggest
# 2  
Old 11-15-2012
Correction:-
Code:
if [[ "$A" = "y" || "$A" = "Y" ]]

# 3  
Old 11-15-2012
i tried its throwing error, marked in red


Code:
#!/bin/sh
echo " Enter your choice  to continue y/Y  OR n/N to quit "
read A
if [ [  "$A" = "y" || "$A" = "Y" ] ]
then
echo " user requested to continue "
##some commands
else
echo " User requested to cancel"
exit 1
fi
exit 0

i passed parameter as Y, it is throwing below error

Code:
 
[ : 14 : missing ]

# 4  
Old 11-15-2012
I did not put any spaces between the square brackets! Remove the spaces and re-try.
# 5  
Old 11-15-2012
You need two "==" in your if statements. A single "=" assigns whatever is after to whatever is before. Double "==" means "is equal to".

if [[ "$A" == "y" || "$A" == "Y" ]]

---------- Post updated at 12:45 PM ---------- Previous update was at 12:43 PM ----------

Quote:
Originally Posted by orangeSunshine
You need two "==" in your if statements. A single "=" assigns whatever is after to whatever is before. Double "==" means "is equal to".

if [[ "$A" == "y" || "$A" == "Y" ]]
Actually, I guess it will work either way but two "==" would be a good habit to get into.
# 6  
Old 11-15-2012
[[ .. ]] is not POSIX syntax and as such should not be used with #!/bin/sh The correct syntax would be:
Code:
if [ "$A" = "y" ] || [ "$A" = "Y" ]
then


--
The correct bash/ksh syntax would be
Code:
if [[ $A == "y" || $A == "Y" ]]
then

or
Code:
if [[ $A == [yY] ]]
then

Last edited by Scrutinizer; 11-15-2012 at 04:43 PM..
# 7  
Old 11-15-2012
try this
if [ "$A" -eq "y" || "$A" -eq "Y" ]
and check spaces
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