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Old 02-26-2014, 02:11 PM   #1
elalexluna83
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Registered: Mar 2012
Posts: 41

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BASH take argument if user don't type anything


Hi everyone, i have the following script but as you can see, you need to type "y" or "n" in order to do something, is there any way for the script to send a "y" or a "n" after 10 seconds if the user don't type anything?

Code:
echo " Continue ..."
while true ; do
	read ANSWER
	case $ANSWER in
	Y|y )
#		echo " you said yes"
		date
		;;
	N|n )
#		echo " you said no"
		exit 255
		;;
	* )
		exit 1
		;;
esac
done
 
Old 02-26-2014, 02:20 PM   #2
suicidaleggroll
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Registered: Nov 2010
Location: Colorado
Distribution: OpenSUSE, CentOS
Posts: 3,614

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From "man read"

Quote:
-t timeout
Cause read to time out and return failure if a complete
line of input is not read within timeout seconds. time‐
out may be a decimal number with a fractional portion
following the decimal point. This option is only effec‐
tive if read is reading input from a terminal, pipe, or
other special file; it has no effect when reading from
regular files. If timeout is 0, read returns success if
input is available on the specified file descriptor,
failure otherwise. The exit status is greater than 128
if the timeout is exceeded.
Use $? to check read's exit status and then take the necessary action.

Last edited by suicidaleggroll; 02-26-2014 at 02:21 PM.
 
Old 02-26-2014, 02:42 PM   #3
elalexluna83
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Registered: Mar 2012
Posts: 41

Original Poster
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Great, you just gave me an idea. I will try it and post here.

Thanks again.
 
Old 02-26-2014, 03:40 PM   #4
elalexluna83
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Registered: Mar 2012
Posts: 41

Original Poster
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This is the final script i had in mind.

Code:
#!/bin/bash

clear
COUNTER=0
echo " Continue ... [y|n]"
while true ; do
	read -t 60 ANSWER
	if [ $? -eq 0 ]; then
		case $ANSWER in
		Y|y )
			xdotool mousemove 1200 10
			sleep 3
			xdotool click 3
			xdotool mousemove 100 100
			;;
		N|n )
			exit 255
			;;
		* )
			exit 1
			;;
		esac
	else
			xdotool mousemove 1200 10
			sleep 3
			xdotool click 3
			xdotool mousemove 100 100
	fi
let COUNTER=COUNTER+1
echo $COUNTER
done
 
Old 02-26-2014, 08:16 PM   #5
grail
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Registered: Sep 2009
Location: Perth
Distribution: Manjaro
Posts: 7,884

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Your script currently only prompts the user once to continue, yet if 'Y' is chosen a blank prompt will appear again and it may not be obvious to the user that they need to enter something.

Also I am a big believer in not replicating code if possible, so you could optionally do something like:
Code:
#!/bin/bash

clear
COUNTER=0

while true ; do
	read -n 1 -p " Continue ... [y|n]" -t 60 ANSWER
	ANSWER=${ANSWER:-Y}
	
	case ${ANSWER^} in
	Y )
		xdotool mousemove 1200 10
		sleep 3
		xdotool click 3
		xdotool mousemove 100 100
		;;
	N )
		exit 255
		;;
	* )
		exit 1
		;;
	esac
	(( COUNTER++ ))
	echo $COUNTER
done
 
  


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