chainsaw: 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/chainsaw - from package: log4j

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

On Debian possible default full paths are:

/usr/bin/chainsaw - from package: prime-phylo

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

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