#!/bin/bashsource ./cnl_function.sh#function of installing gitinstall_git(){  #download the compressed package  cd /usr/local/src  #if compressed package is empty then download  [ -f git-2.2.1.tar.gz ] || wget https://www.kernel.org/pub/software/scm/git/git-2.2.1.tar.gz  check_ok  tar -zxf git-2.2.1.tar.gz  check_ok  [ -d /usr/local/git ] && mv /usr/local/git /usr/local/git_`date +%s`    cd git-2.2.1  check_ok    for p in expat-devel   do     myum $p  done  make prefix=/usr/local/git all  make prefix=/usr/local/git install  check_ok    if ! grep '^git:' /etc/group  then     groupadd git  fi      if ! grep '^git:' /etc/passwd  then    useradd -m git -s /usr/local/git/bin/git-shell -g git  fi    check_ok  ln -s /usr/local/git/bin/git /usr/local/bin/git    echo "git is installed finish."  }read -p "Enter （Y） to start installation git :" nif [ $n == 'Y' ]then   echo "Start installation==============================================================================================================================>"  install_gitelse   echo "Cancel the installation."fi

git --version