pt-align: 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/pt-align - from package: percona-toolkit

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