bti-shrink-urls: 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/bti-shrink-urls - from package: bti

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

On Debian possible default full paths are:

/usr/bin/bti-shrink-urls - from package: bti

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

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