aqbanking-cli: 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 CentOS possible default full paths are:

/usr/bin/aqbanking-cli - from package: aqbanking

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/aqbanking-cli - from package: aqbanking-tools

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

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