fishsound-decode: 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/fishsound-decode - from package: libfishsound-tools

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

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