otf2-estimator: 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/otf2-estimator - from package: otf2

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

Error in other languages:
otf2-estimator: bevel nie gevind nie
otf2-estimator: comandă negăsită
otf2-estimator: comando não encontrado
otf2-estimator: commande introuvable
otf2-estimator: command not found
otf2-estimator: käsku ei ole
otf2-estimator: không tìm thấy lệnh
otf2-estimator: komanda nerasta
otf2-estimator: Kommando nicht gefunden.
otf2-estimator: kommandot finns inte
otf2-estimator: komut yok
otf2-estimator: nie znaleziono polecenia
otf2-estimator: níor aimsíodh an t-ordú
otf2-estimator: no se encontró la orden
otf2-estimator: no s'ha trobat l'ordre
otf2-estimator: opdracht niet gevonden
otf2-estimator: parancs nem található
otf2-estimator: perintah tidak ditemukan
otf2-estimator: príkaz nenájdený
otf2-estimator: příkaz nenalezen
otf2-estimator: команда не найдена
otf2-estimator: командата не е открита
otf2-estimator: 命令找不到
otf2-estimator: コマンドが見つかりません