sigrok-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 Debian possible default full paths are:

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

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

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