ircflush: 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/sbin/ircflush - from package: ircii
/usr/lib/scrollz/bin/ircflush - from package: scrollz

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

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