fcasplit: 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/fcasplit - from package: patchy

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

On Debian possible default full paths are:

/usr/bin/fcasplit - from package: nypatchy

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

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