fishsound-identify: 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-identify - from package: libfishsound-tools

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

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