swab: 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 Debian possible default full paths are:

/usr/bin/swab - from package: odin

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

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