ctlib: 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/ctlib - from package: ncl

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

On Debian possible default full paths are:

/usr/bin/ctlib - from package: ncl-ncarg

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

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