grdcut: 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/grdcut - 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/grdcut - from package: GMT

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

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