obminimize: 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/obminimize - from package: openbabel

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

On Debian possible default full paths are:

/usr/bin/obminimize - from package: openbabel

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

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