catkin: 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/catkin - from package: python-catkin_tools

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

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