shlock: 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/lib/news/bin/shlock - from package: inn2
/usr/lib/news/bin/shlock - from package: inn

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

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