conch: 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/conch - from package: python-twisted-conch

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

On Debian possible default full paths are:

/usr/bin/conch - from package: python-twisted-conch

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

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