iki-ssh-unsafe: 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/iki-ssh-unsafe - from package: ikiwiki-hosting-web

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

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