tcsd: 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/sbin/tcsd - from package: trousers

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

On Debian possible default full paths are:

/usr/sbin/tcsd - from package: trousers

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

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