salt-minion: 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/salt-minion - from package: salt-minion

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/salt-minion - from package: salt-minion

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

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