multiple vcards (*.vcf) to single vcard converter (all.vcf)

multiple_vcard2single.sh

#! /bin/sh

# multiple vcards (*.vcf) to single vcard converter (all.vcf)
# usage: place in vcard directory and execute to convert multiple .vcf from current directory to single one named all.vcf

# do for all .vcf files from directory
for file in *.vcf; do

    # add file content do single vcard
    cat "$file" >> ../all.vcf
    
    # add line break
    echo "" >> ../all.vcf
done