eric4: 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/eric4 - from package: eric

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

Error in other languages:
eric4: bevel nie gevind nie
eric4: comandă negăsită
eric4: comando não encontrado
eric4: commande introuvable
eric4: command not found
eric4: käsku ei ole
eric4: không tìm thấy lệnh
eric4: komanda nerasta
eric4: Kommando nicht gefunden.
eric4: kommandot finns inte
eric4: komut yok
eric4: nie znaleziono polecenia
eric4: níor aimsíodh an t-ordú
eric4: no se encontró la orden
eric4: no s'ha trobat l'ordre
eric4: opdracht niet gevonden
eric4: parancs nem található
eric4: perintah tidak ditemukan
eric4: príkaz nenájdený
eric4: příkaz nenalezen
eric4: команда не найдена
eric4: командата не е открита
eric4: 命令找不到
eric4: コマンドが見つかりません