xotclsh: 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:

/usr/bin/xotclsh - from package: xotcl-shells

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

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