gmtdigitize: 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/gmtdigitize - 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/gmtdigitize - from package: GMT

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

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