tggcov: 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/tggcov - from package: ggcov

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

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