termscu: 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/termscu - from package: dcmtk

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

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