wks2csv: 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/wks2csv - from package: libwps-tools

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

Error in other languages:
wks2csv: bevel nie gevind nie
wks2csv: comandă negăsită
wks2csv: comando não encontrado
wks2csv: commande introuvable
wks2csv: command not found
wks2csv: käsku ei ole
wks2csv: không tìm thấy lệnh
wks2csv: komanda nerasta
wks2csv: Kommando nicht gefunden.
wks2csv: kommandot finns inte
wks2csv: komut yok
wks2csv: nie znaleziono polecenia
wks2csv: níor aimsíodh an t-ordú
wks2csv: no se encontró la orden
wks2csv: no s'ha trobat l'ordre
wks2csv: opdracht niet gevonden
wks2csv: parancs nem található
wks2csv: perintah tidak ditemukan
wks2csv: príkaz nenájdený
wks2csv: příkaz nenalezen
wks2csv: команда не найдена
wks2csv: командата не е открита
wks2csv: 命令找不到
wks2csv: コマンドが見つかりません