List recently checked out git branches and quickly jump to one

.bashrc

# Add to your .bashrc or sourced alias file
#
# Without any arguments, lists the last 9 branches you've been
# on, prompts for a number, and then switches you back to the
# corresponding branch.
#
# When passed a number as an argument, instantly switches you
# to the corresponding branch. This is particularly useful for
# toggeling back to your previous branch with `grb 1`.
function grb() {                                                                
  if [ $# -eq 0 ]; then                                                         
    branches=$(git reflog | grep 'moving from' | head -10 | tail -9 | sed -e 's/.* to \(.*\)$/\1/');
    i=1                                                                         
    for branch in $branches; do                                                 
      echo "$i) $branch"                                                        
      ((i++))                                                                   
    done                                                                        
    read -n 1 -p "# " choice                                                    
    if [[ $choice =~ ^[1-9]$ ]]; then                                           
      echo                                                                      
      git checkout @{-$choice}                                                  
    else                                                                        
      echo "Invalid selection: $choice"                                         
    fi                                                                          
  else                                                                          
    if [[ $1 =~ ^[1-9]$ ]]; then                                                
      git checkout @{-$1}                                                       
    else                                                                        
      echo "Invalid selection: $1"                                              
    fi                                                                          
  fi                                                                            
}            

usage example

$ grb
1) some_feature_branch
2) the_ugly_buggy
3) some_other_branch
4) master
5) staging
6) some_feature_branch
7) staging
8) debug_that_thing
9) some_feature_branch
# 8
Switched to branch 'debug_that_thing'

# Or, if you're feeling lucky... (best if just toggeling back to previous branch with `grb 1`)
$ grb 8
Switched to branch 'debug_that_thing'