eidenv: 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/eidenv - from package: opensc

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

On Debian possible default full paths are:

/usr/bin/eidenv - from package: opensc

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

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