vidir: 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/vidir - from package: moreutils

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

On Debian possible default full paths are:

/usr/bin/vidir - from package: moreutils

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

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