cellwriter: 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/cellwriter - from package: cellwriter

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

On Debian possible default full paths are:

/usr/bin/cellwriter - from package: cellwriter

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

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