shell CD唱片应用程序

#!/bin/bash

# very simple example shell script for managing a CD collection
# Copyright (C) 1996-2007 Wiley Publishing Inc

menu_choice=""
current_cd=""
title_file="title_cdb"
tracks_file="tracks.cdb"
temp_file=/tmp/cdb.$$
trap 'rm -f $tmp_file' EXIT

get_return(){
echo -e "Press return \c"
read x
return 0
}
get_confirm(){
echo -e "Are you sure? \c"
while true
do
read x
case "$x" in
y | yes | Y | Yes | YES )
return 0;;
n | no  | N | NO | No )
echo
echo "Canceled"
return 1;;
*) echo "Please enter yes or no";;
esac
done
}

set_menu_choice(){
clear
echo "Options :-"
echo
echo "	a) Add new CD"
echo "	f) find CD"
echo "	c) Count the CDs and tracks in the catalog"
if [ "$cdcatnum" != "" ]; then
echo "	l) List tracks on $cdtitle"
echo "	r) remove $cdtitle"
echo "	u) update track information for $cdtitle"
fi
echo "	q) QUIT"
echo
echo -e "Please enter choice then press return \c"
read menu_choice
return
}

insert_title(){
echo $* >> $title_file
return
}

insert_track(){
echo $* >> $tracks_file
return
}

add_record_tracks(){
echo "Enter track information for this CD"
echo "When no more tracks enter q"
cdtrack=1
cdttitle=""
while [ "$cdttitle" != "q" ]
do
echo -e "Track $cdtrack,track title ? \c"
read tmp
cdttitle=${tmp%%,*}
if [ "$tmp" != "$cdttitle" ];then
echo "Sorry,no command allowed"
continue;
fi
if [ -n "$cdttitle" ] ; then
if [ "$cdttitle" != "q" ] ; then
insert_track $cdcatnum,$cdtrack,$cdttitle
fi
else
cdtrack=$((cdtrack-1))
fi
cdtrack=$((cdtrack+1))
done
}
add_records(){
# Prompt for the initial information

echo -e "Enter catalog name \c"
read tmp
cdcatnum=${tmp%%,*}

echo -e "Enter title \c"
read tmp
cdtitle=${tmp%%,*}

echo -e "Enter type \c"
read tmp
cdtype=${tmp%%,*}

echo -e "Enter artist/composer \c"
read tmp
cdac=${tmp%%,*}

# Check that they want to enter the information

echo About to add new entry
echo "$cdcatnum $cdtitle $cdtype $cdac"

# If confirmed the appen it to the titles file

if get_confirm ; then
insert_title $cdcatnum,$cdtitle,$cdtype,$cdac
add_record_tracks
else
remove_records
fi

return
}

find_cd(){
if [ "$1" = "n" ];then
asklist=n
else
asklist=y
fi
cacatnum=""
echo -e "Enter a string to search for in the CD title \c"
read searchstr
if [ "$searchstr" = "" ];then
return 0
fi

grep "$searchstr" $title_file > $temp_file

set $(wc -l $temp_file)
linesfound=$1

case "$linesfound" in
0)	echo "Sorry, nothing found"
get_return
return 0
;;
1)	;;
2)	echo "Sorry,not unique"
echo "found the following"
cat $temp_file
get_return
retrun 0
esac

IFS=","
read cdcatnum cdtitle cdtype cdac < $temp_file

IFS=" "

if [ -z "$cdcatnum" ];then
echo "Sorry.could not exact catalog field from $temp_file"
get_return
return 0
fi

echo
echo Catalog number $cdcatnum
echo Title: $cdtitle
echo Type: $cdtype
echo Artist/Composer: $cdac
echo
get_return

if [ "$asklist" = "y" ]; then
echo -e "View tracks for this CD ?\c"
read x
if [ "$x" = "y" ];then
echo
list_tracks
echo
fi
fi
return -1
}

update_cd(){
if [ -z "$cdcatnum" ]; then
echo "You must select a CD first"
find_cd n
fi
if [ -n "$cdcatnum" ]; then
echo "Current tracks are :-"
list_tracks
echo
echo "This will re-enter the tracks for $cdtitle"
get_confirm && {
grep -v "^${cdcatnum}," $tracks_file > $temp_file
mv $temp_file $tracks_file
echo
add_record_tracks
}
fi
return
}

count_cds(){
set $(wc -l $title_file)
num_titles=$1
set $(wc -l $tracks_file)
num_tracks=$1
echo found $num_titles CDs,with a total of $num_tracks tracks
get_return
return
}

remove_records(){
if [ -z "$cdcatnum" ]; then
echo you must Select a CD first
find_cd n
fi

if [ -n "$cdcatnum" ]; then
echo "You are about to delete $cdtitle"
get_confirm && {
grep -v "^S{cdcatnum}," $title_file > $temp_file
mv $temp_file $title_file
grep -v "^${cdcatnum}," $tracks_file > $temp_file
mv $temp_file $tracks_file
cdcatnum=""
echo Entry removed
}
get_retrun
fi
return
}

list_tracks(){
if [ "$cdcatnum" = "" ]; then
echo no CD selected yet
return
else
grep "^${cdcatnum}," $tracks_file > $temp_file
num_tracks=$(wc -l $temp_file)
if [ "$num_tracks" = "0" ]; then
echo no tracks found For $cdtitle
else {
echo
echo "$cdtitle :-"
echo
cut -f 2- -d ,$temp_file
echo
} | ${PAGER:-more}
fi
fi
get_return
return
}

rm -f $temp_file
if [ ! -f $title_file ];then
touch $title_file
fi
if [ ! -f $tracks_file ];then
touch $tracks_file
fi

# Now the application proper

clear
echo
echo
echo "Mini CD manager"
sleep 1

quit=n
while [ "$quit" != "y" ];
do
set_menu_choice
case "$menu_choice" in
a)	add_records;;
r)	remove_records;;
f)	find_cd_y;;
u)	update_cd;;
c)	count_cds;;
l)	list_tracks;;
b)
echo
more $title_file
echo
get_return;;
q | Q )	quit=y;;
*)	echo "Sorry.choice not recognized";;
esac
done

#Tidy up and leave

rm -f $temp_file
echo "Finished"
exit 0