replcon: 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/bin/replcon - from package: setools-console

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

On Debian possible default full paths are:

/usr/bin/replcon - from package: setools

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

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