munch: 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/munch - from package: hunspell-devel

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

On Debian possible default full paths are:

/usr/bin/munch - from package: hunspell-tools
/usr/bin/munch - from package: myspell-tools

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

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