re-PCR: 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/re-PCR - from package: ncbi-epcr

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