pamsummcol: 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/pamsummcol - from package: netpbm-progs

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

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