wish8.6: 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/wish8.6 - from package: tk8.6

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

Error in other languages:
wish8.6: bevel nie gevind nie
wish8.6: comandă negăsită
wish8.6: comando não encontrado
wish8.6: commande introuvable
wish8.6: command not found
wish8.6: käsku ei ole
wish8.6: không tìm thấy lệnh
wish8.6: komanda nerasta
wish8.6: Kommando nicht gefunden.
wish8.6: kommandot finns inte
wish8.6: komut yok
wish8.6: nie znaleziono polecenia
wish8.6: níor aimsíodh an t-ordú
wish8.6: no se encontró la orden
wish8.6: no s'ha trobat l'ordre
wish8.6: opdracht niet gevonden
wish8.6: parancs nem található
wish8.6: perintah tidak ditemukan
wish8.6: príkaz nenájdený
wish8.6: příkaz nenalezen
wish8.6: команда не найдена
wish8.6: командата не е открита
wish8.6: 命令找不到
wish8.6: コマンドが見つかりません