tcpsvd: command not found

Have You tried accessing the binary with the full path?

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/tcpsvd - from package: ipsvd

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