git-strip-merge: 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/git-strip-merge - from package: git-tools

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

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