hasktags: 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/bin/hasktags - from package: hasktags

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

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