Ever wanted to get rid of email contacts in your Android phone from auto syncing? You can use this script to do so - simply export your contacts on your Android phone to a VCF file, transfer the VCF file to your PC, and run this script on the VCF file to generated a filtered VCF file that excludes all contacts that don't have a telephone number associated.
Run ./vcf_cleanup <path-to-vcf-file> to start.