perror: 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/perror - from package: mysql55w-server
/usr/bin/perror - from package: mysql-server

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

On Debian possible default full paths are:

/usr/bin/perror - from package: mariadb-server-10.0
/usr/bin/perror - from package: mysql-server-5.5

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

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