tangerine: 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/tangerine - from package: tangerine

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

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