rosdep: 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/rosdep - from package: python-rosdep

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

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