yaskkserv_hairy: 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 Debian possible default full paths are:

/usr/sbin/yaskkserv_hairy - from package: yaskkserv

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

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