Shell Programming and Scripting

select app from the menu:  ABC DEF GHI JKL ALL  # ALL will select all the apps in the menu  echo "Enter your option" read option;  if [ ${option} = "ALL" ] then      <execute the below command> elif [ ${option} = "option" ]     # option is the 1 selection from menu...not ALL     <execute the below command> else    echo wrong option."" fi

elif

if [ $option != "*" ] || [ $option != "?" ] || [ $option != "&" ]

read option
sdj$/%§keb()/&eWEqwe
echo $(tr 'a-z' 'A-Z' <<< ${option//[[:punct:]]})
SDJKEBEWEQWE

AB*
DE?
GH#
IJ.

read input
echo "$input" | grep -q [\#\?\*\.] && exit 1

#!/usr/bin/ksh

read -r option

if [[ "$option" =~ [^[:alpha:]] ]]; then
 echo "Variable 'option' contains non-alphabetic stuff."
 exit 1
fi

echo "OK"

echo "abcf*?123-" | sed 's/[^a-Z]*//g'

echo "abcf*?123-" | sed 's/[^-]*//g'

abcf-

echo "abcf*?123-" | sed 's/[^a-Z-]*//g'
abcf-