dotmatcher: 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/dotmatcher - from package: emboss

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

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