Bash script to separate a single vCard containing multiple contacts into multiple vCard files each with its own contact.

contact-split.sh

#!/bin/bash -
#
# Bash script to separate a single vCard containing multiple contacts
# into multiple vCard files each with its own contact.
#
# Usage:
#
#     ./contact-split.sh < INPUT_FILE.vcf
#
# where INPUT_FILE.vcf is, of course, the monolithic vCard  file.
#

main () {
    local card_lines
    local card_guid
    declare -a card_lines

    while read line; do
        # Append each line to the end of this array.
        card_lines=("${card_lines[@]}" "$line")

        # Get the contact's GUID, this becomes the file name.
        if [[ "$line" =~ ^X-ABUID: ]]; then
            card_guid=$(echo -n "$line" | cut -d ':' -f 2)
        fi

        # This is the end of the card, so output it.
        if [[ "$line" =~ ^END:VCARD ]]; then
            printf "%s\n" "${card_lines[@]}" > "$(echo -n "$card_guid" | tr 'A-Z' 'a-z' | tr -d '\r').vcf"
            unset -v card_lines
        fi
    done < "$1"
}

main "$1"