ircmarkers: 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/ircmarkers - from package: ircmarkers

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

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