yum-complete-transaction: 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/sbin/yum-complete-transaction - from package: yum-utils

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

On Debian possible default full paths are:

/usr/sbin/yum-complete-transaction - from package: yum-utils

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

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