catdoc: 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/catdoc - from package: catdoc

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

On Debian possible default full paths are:

/usr/bin/catdoc - from package: catdoc

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

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