crash: 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/crash - from package: crash

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

On Debian possible default full paths are:

/usr/bin/crash - from package: crash

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

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