pmdesc: 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/pmdesc - from package: perl-pmtools

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

On Debian possible default full paths are:

/usr/bin/pmdesc - from package: pmtools

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

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