folks-import: 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/folks-import - from package: folks-tools

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

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