tee: 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/tee - from package: coreutils

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

On Debian possible default full paths are:

/usr/bin/tee - from package: coreutils
/usr/lib/plan9/bin/tee - from package: 9base

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

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