larch: 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/larch - from package: larch

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

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