atslex: 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/atslex - from package: ats-lang-anairiats
/usr/lib/ats-anairiats-0.2.11/bin/atslex - from package: ats-lang-anairiats

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