show-changed-rco: 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/show-changed-rco - from package: yum-utils

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

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