tophat-fusion-post: 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 Debian possible default full paths are:

/usr/bin/tophat-fusion-post - from package: tophat

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