trimseq: 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/trimseq - from package: emboss

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

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