sysdig: 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 Debian possible default full paths are:

/usr/bin/sysdig - from package: sysdig

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