socat: 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/socat - from package: socat

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

On Debian possible default full paths are:

/usr/bin/socat - from package: socat

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

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