jirc: 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/jirc - from package: jirc

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

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