vcf2birthday: 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/vcf2birthday - from package: birthday

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

Error in other languages:
vcf2birthday: bevel nie gevind nie
vcf2birthday: comandă negăsită
vcf2birthday: comando não encontrado
vcf2birthday: commande introuvable
vcf2birthday: command not found
vcf2birthday: käsku ei ole
vcf2birthday: không tìm thấy lệnh
vcf2birthday: komanda nerasta
vcf2birthday: Kommando nicht gefunden.
vcf2birthday: kommandot finns inte
vcf2birthday: komut yok
vcf2birthday: nie znaleziono polecenia
vcf2birthday: níor aimsíodh an t-ordú
vcf2birthday: no se encontró la orden
vcf2birthday: no s'ha trobat l'ordre
vcf2birthday: opdracht niet gevonden
vcf2birthday: parancs nem található
vcf2birthday: perintah tidak ditemukan
vcf2birthday: príkaz nenájdený
vcf2birthday: příkaz nenalezen
vcf2birthday: команда не найдена
vcf2birthday: командата не е открита
vcf2birthday: 命令找不到
vcf2birthday: コマンドが見つかりません