gist: 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 Debian possible default full paths are:

/usr/lib/debug/usr/lib/yorick/bin/gist - from package: yorick-dbg
/usr/bin/gist - from package: yorick
/usr/lib/yorick/bin/gist - from package: yorick

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

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