watch-vmtouch: 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/sbin/watch-vmtouch - from package: vmtouch

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

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