vcf-to-ics: 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-to-ics - from package: vpim

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

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