bsd-csh: 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 Debian possible default full paths are:

/bin/bsd-csh - from package: csh

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

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