pjrec: 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/pjrec - from package: ctsim

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