perlsh: 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/perlsh - from package: libterm-readline-gnu-perl

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

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