htproxydestroy: 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/htproxydestroy - from package: gridsite-clients

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

On Debian possible default full paths are:

/usr/bin/htproxydestroy - from package: gridsite-clients

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

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