wish8.5: command not found

Have You tried accessing the binary with the full path?

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/wish8.5 - from package: tk

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

On Debian possible default full paths are:

/usr/bin/wish8.5 - from package: tk8.5

You may install the required package with command apt-get install {package}
Error in other languages:
wish8.5: bevel nie gevind nie
wish8.5: comandă negăsită
wish8.5: comando não encontrado
wish8.5: commande introuvable
wish8.5: command not found
wish8.5: käsku ei ole
wish8.5: không tìm thấy lệnh
wish8.5: komanda nerasta
wish8.5: Kommando nicht gefunden.
wish8.5: kommandot finns inte
wish8.5: komut yok
wish8.5: nie znaleziono polecenia
wish8.5: níor aimsíodh an t-ordú
wish8.5: no se encontró la orden
wish8.5: no s'ha trobat l'ordre
wish8.5: opdracht niet gevonden
wish8.5: parancs nem található
wish8.5: perintah tidak ditemukan
wish8.5: príkaz nenájdený
wish8.5: příkaz nenalezen
wish8.5: команда не найдена
wish8.5: командата не е открита
wish8.5: 命令找不到
wish8.5: コマンドが見つかりません