zipsplit: 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/zipsplit - from package: zip

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

On Debian possible default full paths are:

/usr/bin/zipsplit - from package: zip

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

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