teqser: 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 CentOS possible default full paths are:

/usr/bin/teqser - from package: aqsis-core

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/teqser - from package: aqsis

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

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