dstat: command not found

Have You tried accessing the binary with the full path?

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/dstat - from package: dstat

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

On Debian possible default full paths are:

/usr/bin/dstat - from package: dstat

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