skin: 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/lib64/mpich/bin/skin - from package: scalasca-mpich
/usr/lib64/openmpi/bin/skin - from package: scalasca-openmpi

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

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