inspircd: 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/inspircd - from package: inspircd

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

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