pscoast: 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/pscoast - 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/pscoast - from package: GMT

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

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