ikiwiki-transition: 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 CentOS possible default full paths are:

/usr/bin/ikiwiki-transition - from package: ikiwiki

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

On Debian possible default full paths are:

/usr/bin/ikiwiki-transition - from package: ikiwiki

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

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