pg_filedump: 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/pg_filedump - from package: rhdb-utils

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

On Debian possible default full paths are:

/usr/lib/postgresql/9.4/bin/pg_filedump - from package: postgresql-filedump

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

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