shninfo: 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/bin/shninfo - from package: shntool

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

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