example02.07

UNIX[1].shell范例精解(第4版)_code

#!/bin/bash 
# Gnu bash versions 2.x
# The Party Program--Invitations to friends from the 
# "guest" file 
#guestfile=~/shell/guests
guestfile=./guests
if [[ ! -e "$guestfile" ]] 
then
	printf "${guestfile##*/} non-existent"
	exit 1
fi
export PLACE="Sarotini's"
(( Time=$(date +%H) + 1 ))
declare -a foods=(cheese crackers shrimp drinks '"hot dogs"'
                  sandwiches)  
   declare -i  n=0
for person in $(cat $guestfile) 
do
	if  [[ $person == root ]]
	then
		continue
	else 
		# Start of here document
		mail -v -s "Party" $person <<- FINIS 
		Hi $person! Please join me at $PLACE for a party! 
		Meet me at $Time o'clock.
		I'll bring the ice cream. Would you please bring
		${foods[$n]} and anything else you would like to eat?
		Let me know if you can make it.
		       Hope to see you soon.
                          Your pal,
                          ellie@$(hostname)
		FINIS
		n=n+1  
		if (( ${#foods[*]} ==  $n )) 
		then
		   declare -a foods=(cheese crackers shrimp drinks
		                     `"hot dogs"` sandwiches)
            n=0
		fi
	fi
done		
printf "Bye..."