vidalia: command not found

Have You tried accessing the binary with the full path?

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/vidalia - from package: vidalia

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