purple-remote: 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/purple-remote - from package: libpurple

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

On Debian possible default full paths are:

/usr/bin/purple-remote - from package: libpurple-bin

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

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