sow: command not found

Have You tried accessing the binary with the full path?

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/sow - from package: rubygem-hoe
/usr/lib/ruby/gems/1.8/gems/hoe-3.13.0/bin/sow - from package: rubygem-hoe

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

On Debian possible default full paths are:

/usr/bin/sow - from package: ruby-hoe

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