stnmap: 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/stnmap - from package: grads

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

On Debian possible default full paths are:

/usr/bin/stnmap - from package: grads

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

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