sss_groupshow: 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/sbin/sss_groupshow - from package: sssd-tools

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

On Debian possible default full paths are:

/usr/sbin/sss_groupshow - from package: sssd-tools

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

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