rosws: 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/rosws - from package: python-rosinstall

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

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