show-snps: 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/show-snps - from package: mummer

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

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