fvshmem: 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/fvshmem - from package: fawkes-firevision-tools

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

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