bp_oligo_count: command not found

Have You tried accessing the binary with the full path?

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/bp_oligo_count - from package: bioperl

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