pamsplit: 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/pamsplit - from package: netpbm-progs

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

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