smsd: 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/sbin/smsd - from package: smstools

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

On Debian possible default full paths are:

/usr/sbin/smsd - from package: gnokii-smsd
/usr/sbin/smsd - from package: smstools

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

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