myproxy-info: 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/myproxy-info - from package: myproxy

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

On Debian possible default full paths are:

/usr/bin/myproxy-info - from package: myproxy

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

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