imrot: 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/imrot - from package: wcstools

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

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