condor_vm-gahp: 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/sbin/condor_vm-gahp - from package: condor-vm-gahp

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

On Debian possible default full paths are:

/usr/sbin/condor_vm-gahp - from package: htcondor

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

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