md5sum-lite: 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/md5sum-lite - from package: samtools

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

Error in other languages:
md5sum-lite: bevel nie gevind nie
md5sum-lite: comandă negăsită
md5sum-lite: comando não encontrado
md5sum-lite: commande introuvable
md5sum-lite: command not found
md5sum-lite: käsku ei ole
md5sum-lite: không tìm thấy lệnh
md5sum-lite: komanda nerasta
md5sum-lite: Kommando nicht gefunden.
md5sum-lite: kommandot finns inte
md5sum-lite: komut yok
md5sum-lite: nie znaleziono polecenia
md5sum-lite: níor aimsíodh an t-ordú
md5sum-lite: no se encontró la orden
md5sum-lite: no s'ha trobat l'ordre
md5sum-lite: opdracht niet gevonden
md5sum-lite: parancs nem található
md5sum-lite: perintah tidak ditemukan
md5sum-lite: príkaz nenájdený
md5sum-lite: příkaz nenalezen
md5sum-lite: команда не найдена
md5sum-lite: командата не е открита
md5sum-lite: 命令找不到
md5sum-lite: コマンドが見つかりません