tqsl: 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/tqsl - from package: trustedqsl

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

On Debian possible default full paths are:

/usr/bin/tqsl - from package: trustedqsl

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

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