msggrep: 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/msggrep - from package: gettext

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

On Debian possible default full paths are:

/usr/bin/msggrep - from package: gettext

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

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