wsl: 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/wsl - from package: wsl

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

On Debian possible default full paths are:

/usr/bin/wsl - from package: wsl

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

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