editclient: 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

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/editclient - from package: xemacs21-support

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