tcpcli: 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/tcpcli - from package: ion

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

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