SpectraMerger: 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/SpectraMerger - from package: topp

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

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