imcadmin: 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/imcadmin - from package: ion

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

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