snmp.sh: 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/share/doc/librrd-simple-perl/examples/rrd-server/bin/snmp.sh - from package: librrd-simple-perl

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

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