rmdic: 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 CentOS possible default full paths are:

/usr/bin/rmdic - from package: Canna

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/rmdic - from package: canna-utils

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

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