grdclip: 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/grdclip - 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/grdclip - from package: GMT

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

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