implantisomd5: 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 CentOS possible default full paths are:

/usr/bin/implantisomd5 - from package: isomd5sum

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/implantisomd5 - from package: isomd5sum

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

Error in other languages:
implantisomd5: bevel nie gevind nie
implantisomd5: comandă negăsită
implantisomd5: comando não encontrado
implantisomd5: commande introuvable
implantisomd5: command not found
implantisomd5: käsku ei ole
implantisomd5: không tìm thấy lệnh
implantisomd5: komanda nerasta
implantisomd5: Kommando nicht gefunden.
implantisomd5: kommandot finns inte
implantisomd5: komut yok
implantisomd5: nie znaleziono polecenia
implantisomd5: níor aimsíodh an t-ordú
implantisomd5: no se encontró la orden
implantisomd5: no s'ha trobat l'ordre
implantisomd5: opdracht niet gevonden
implantisomd5: parancs nem található
implantisomd5: perintah tidak ditemukan
implantisomd5: príkaz nenájdený
implantisomd5: příkaz nenalezen
implantisomd5: команда не найдена
implantisomd5: командата не е открита
implantisomd5: 命令找不到
implantisomd5: コマンドが見つかりません