licensecheck: 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/licensecheck - from package: rpmdevtools

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

On Debian possible default full paths are:

/usr/bin/licensecheck - from package: devscripts

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

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