pchrt: 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/pchrt - from package: python-schedutils

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

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