sharedindexsplit: 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/sbin/sharedindexsplit - from package: courier-base

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

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