gmtlist: 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/gmtlist - from package: GMT

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

On Debian possible default full paths are:

/usr/lib/gmt/bin/gmtlist - from package: GMT

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

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