shedskin: 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/shedskin - from package: shedskin

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

On Debian possible default full paths are:

/usr/bin/shedskin - from package: shedskin

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

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