vcf-dump: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/vcf-dump - from package: vpim

You may install the required package with command apt-get install {package}

Error in other languages:
vcf-dump: bevel nie gevind nie
vcf-dump: comandă negăsită
vcf-dump: comando não encontrado
vcf-dump: commande introuvable
vcf-dump: command not found
vcf-dump: käsku ei ole
vcf-dump: không tìm thấy lệnh
vcf-dump: komanda nerasta
vcf-dump: Kommando nicht gefunden.
vcf-dump: kommandot finns inte
vcf-dump: komut yok
vcf-dump: nie znaleziono polecenia
vcf-dump: níor aimsíodh an t-ordú
vcf-dump: no se encontró la orden
vcf-dump: no s'ha trobat l'ordre
vcf-dump: opdracht niet gevonden
vcf-dump: parancs nem található
vcf-dump: perintah tidak ditemukan
vcf-dump: príkaz nenájdený
vcf-dump: příkaz nenalezen
vcf-dump: команда не найдена
vcf-dump: командата не е открита
vcf-dump: 命令找不到
vcf-dump: コマンドが見つかりません