t1unmac: 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/t1unmac - from package: t1utils

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

On Debian possible default full paths are:

/usr/bin/t1unmac - from package: t1utils

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

Error in other languages:
t1unmac: bevel nie gevind nie
t1unmac: comandă negăsită
t1unmac: comando não encontrado
t1unmac: commande introuvable
t1unmac: command not found
t1unmac: käsku ei ole
t1unmac: không tìm thấy lệnh
t1unmac: komanda nerasta
t1unmac: Kommando nicht gefunden.
t1unmac: kommandot finns inte
t1unmac: komut yok
t1unmac: nie znaleziono polecenia
t1unmac: níor aimsíodh an t-ordú
t1unmac: no se encontró la orden
t1unmac: no s'ha trobat l'ordre
t1unmac: opdracht niet gevonden
t1unmac: parancs nem található
t1unmac: perintah tidak ditemukan
t1unmac: príkaz nenájdený
t1unmac: příkaz nenalezen
t1unmac: команда не найдена
t1unmac: командата не е открита
t1unmac: 命令找不到
t1unmac: コマンドが見つかりません