msguniq: 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/msguniq - from package: gettext

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

On Debian possible default full paths are:

/usr/bin/msguniq - from package: gettext

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

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