e3vi: 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/e3vi - from package: e3

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

On Debian possible default full paths are:

/usr/bin/e3vi - from package: e3

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

Error in other languages:
e3vi: bevel nie gevind nie
e3vi: comandă negăsită
e3vi: comando não encontrado
e3vi: commande introuvable
e3vi: command not found
e3vi: käsku ei ole
e3vi: không tìm thấy lệnh
e3vi: komanda nerasta
e3vi: Kommando nicht gefunden.
e3vi: kommandot finns inte
e3vi: komut yok
e3vi: nie znaleziono polecenia
e3vi: níor aimsíodh an t-ordú
e3vi: no se encontró la orden
e3vi: no s'ha trobat l'ordre
e3vi: opdracht niet gevonden
e3vi: parancs nem található
e3vi: perintah tidak ditemukan
e3vi: príkaz nenájdený
e3vi: příkaz nenalezen
e3vi: команда не найдена
e3vi: командата не е открита
e3vi: 命令找不到
e3vi: コマンドが見つかりません