mergeword: 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/mergeword - from package: Canna

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

On Debian possible default full paths are:

/usr/bin/mergeword - from package: Canna

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

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