jpilot-merge: 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 Debian possible default full paths are:

/usr/bin/jpilot-merge - from package: jpilot

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

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