SocketClient: 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/SocketClient - from package: vtk-testing

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

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