fishsound-info: 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-info - from package: libfishsound-tools

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

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