scs2ps: 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/scs2ps - from package: tn5250

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

Error in other languages:
scs2ps: bevel nie gevind nie
scs2ps: comandă negăsită
scs2ps: comando não encontrado
scs2ps: commande introuvable
scs2ps: command not found
scs2ps: käsku ei ole
scs2ps: không tìm thấy lệnh
scs2ps: komanda nerasta
scs2ps: Kommando nicht gefunden.
scs2ps: kommandot finns inte
scs2ps: komut yok
scs2ps: nie znaleziono polecenia
scs2ps: níor aimsíodh an t-ordú
scs2ps: no se encontró la orden
scs2ps: no s'ha trobat l'ordre
scs2ps: opdracht niet gevonden
scs2ps: parancs nem található
scs2ps: perintah tidak ditemukan
scs2ps: príkaz nenájdený
scs2ps: příkaz nenalezen
scs2ps: команда не найдена
scs2ps: командата не е открита
scs2ps: 命令找不到
scs2ps: コマンドが見つかりません