xsunpinyin-preferences: 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/xsunpinyin-preferences - from package: xsunpinyin

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

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