bookview.tcl: 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/bookview.tcl - from package: bookview

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

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