fbtracemgr: 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/fbtracemgr - from package: firebird

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

On Debian possible default full paths are:

/usr/bin/fbtracemgr - from package: firebird2.5-classic-common
/usr/bin/fbtracemgr - from package: firebird2.5-super

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

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