tset: 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/tset - from package: ncurses

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

On Debian possible default full paths are:

/usr/bin/tset - from package: ncurses-bin

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

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