seqmatchall: 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/seqmatchall - from package: emboss

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

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