ifne: 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/ifne - from package: moreutils

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

On Debian possible default full paths are:

/usr/bin/ifne - from package: moreutils

You may install the required package with command apt-get install {package}

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