vish: 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/vish - from package: vish

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

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