salt-call: 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-call - 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-call - from package: salt-common

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

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