ipmish: 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/ipmish - from package: OpenIPMI

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

On Debian possible default full paths are:

/usr/bin/ipmish - from package: OpenIPMI

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

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