errhdr: 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/errhdr - from package: ncbi-tools-bin

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

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