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Full Discussion: How to add a Y/N option?
Top Forums Shell Programming and Scripting How to add a Y/N option? Post 302970618 by kshji on Saturday 9th of April 2016 03:54:24 AM
Old 04-09-2016
Here is two examples. Also
Code:
read -p

is usable.

Using read -n 1.
Code:
#!/bin/ksh
# bash/ksh93/zsh/... but not dash (=posix)

# if read key ENTER, bash return newline and ksh return carriage return
cr=$'\r'  # ENTER key ksh
while printf "Continue:Y\b"
      read -n 1 response
      printf "\r                  \n"
      case "$response" in
                $cr|Y|y|"") response="Y" ;; # default = ENTER
                n|N) reponse="N" ;;
                *) response="N" ;;
      esac
      [ "$response" = "Y" ]
do
                echo "Do ..."
                date
                echo "..."
done

echo 'Goodbye.'

Using dd = take dump from stdin, 1 char.
Code:
# keypressed, read 1 char from stdin using dd
# works using any sh-shell
readkbd() {
  stty -icanon -echo
  dd bs=1 count=1 2>/dev/null
  stty icanon echo
}

while printf "Continue:Y\b"
      response=$(readkbd)
      printf "\r                  \n"
      case "$response" in
                Y|y|"") response="Y" ;; # default = ENTER
                n|N) reponse="N" ;;
                *) response="N" ;;
      esac
      [ "$response" = "Y" ]
do
                echo "Do ..."
                date
                echo "..."
done

echo 'Goodbye.'

 

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LEARN ABOUT DEBIAN

fcping

FCPING(8)							  Open-FCoE Tools							 FCPING(8)

NAME

       fcping - Fibre Channel Ping (ELS ECHO) tool

SYNOPSIS

       fcping [-fqx] [ -i interval ] [ -c count ] [ -s size ] -h source target

       source = interface | MAC | WWPN | FC-ID

       target = -P WWPN | -N WWPN | -F FC-ID

DESCRIPTION

       The  fcping  command  performs the Fibre Channel FC-LS-2 ECHO ELS command and displays the reply. The max payload for fcping is 2108 bytes.
       When no -c is given, fcping will continue until user interrupts.

OPTIONS

       -f
	   Flood ping

       -q
	   Quiet! just print summary

       -x
	   Hex dump of responses

       -i interval
	   Wait interval seconds between each ping

       -c count
	   Stop after sending count pings

       -h source
	   Source is interface like ethX, MAC address, WWPN, or FC-ID

       -s size
	   Byte-length of ping request payload (max 2108)

       -F FC-ID
	   Destination port ID

       -P WWPN
	   Destination world-wide port name

       -N WWNN
	   Destination world-wide node name

EXAMPLES

       Sends ELS ECHO to Port FC-ID 0xbf0027 from interface n0.170 with max 3 pings.

	   fcping -c 3 -h n0.170 -F 0xbf0027

	   sending echo to 0xBF0027
	   echo    1 accepted			    16.170 ms
	   echo    2 accepted			     7.053 ms
	   echo    3 accepted			     6.803 ms
	   3 frames sent, 3 received 0 errors, 0.000% loss, avg. rt time 10.009 ms

       Sends ELS ECHO to WWNN 0x1000001B213C9DDA from interface n0.170 with max 3 pings and payload size 1500 bytes

	   fcping -c 3 -h n0.170 -s 1500 -N 0x1000001B213C9DDA

	   sending echo to 0xBF0027
	   echo    1 accepted			     6.597 ms
	   echo    2 accepted			     6.925 ms
	   echo    3 accepted			    12.419 ms
	   3 frames sent, 3 received 0 errors, 0.000% loss, avg. rt time 8.647 ms

       Sends ELS ECHO to WWNN 0x1000001B213C9DDA from interface n0.170 continuously with payload of 32 bytes and hex-dump the reply to the screen

	   fcping -x -h n0.170 -s 32 -N 0x1000001B213C9DDA

	   sending echo to 0xBF0027
	   echo    1 accepted			     6.937 ms
	   response length 32
		0 02000000 00000001 00010203 04050607
	       10 08090a0b 0c0d0e0f 10111213 14151617

	   echo    2 accepted			     6.923 ms
	   response length 32
		0 02000000 00000002 00010203 04050607
	       10 08090a0b 0c0d0e0f 10111213 14151617

	   echo    3 accepted			    84.929 ms
	   response length 32
		0 02000000 00000003 00010203 04050607
	       10 08090a0b 0c0d0e0f 10111213 14151617

SEE ALSO

       fcoeadm(8)

SUPPORT

       fcping is part of the fcoe-utils package, maintained through the Open-FCoE project. Resources for both developers and users can be found at
       the Open-FCoE website http://open-fcoe.org/.

Open-FCoE							    05/24/2011								 FCPING(8)
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