minmax: 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/minmax - 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/minmax - from package: GMT

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

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