virt-edit: 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/virt-edit - from package: libguestfs-tools-c

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

On Debian possible default full paths are:

/usr/bin/virt-edit - from package: libguestfs-tools

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

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