smew: 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/smew - from package: mew-beta-bin
/usr/bin/smew - from package: mew-bin

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

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