pamfixtrunc: command not found

Have You tried accessing the binary with the full path?

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/pamfixtrunc - from package: netpbm-progs

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