unifdefall.sh: 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/unifdefall.sh - from package: unifdef

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

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