skel_cat: 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/skel_cat - from package: libadios-bin

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

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