Git-merge as a bash script, requires nodejs for execution. Make this script executable chmod +x git-merge, than do a copy/move to /usr/bin "git-merge [branch]"

git-merge

#!/usr/bin/node

var sys = require('sys')
    , exec = require('child_process').exec
    , current_branch
    , target_branch = process.argv[2];
    
    function puts (error, stdout, stderr){
        sys.print('stdout: ' + stdout);
        sys.print('stderr: ' + stderr);
        if(error !== null) {
            console.log('exec error: ' + error);
        }
    }
        
    exec('git branch|grep "*"', function(err, stdout, stderr){
        if(err == null){
            current_branch = stdout.substring(2);
            console.log(current_branch);
            
            if( target_branch ){
            
                //do a checkout of a target branch
                exec('git checkout ' + target_branch, function(error,stdout, stderr){
                    sys.print('stdout: ' + stdout);
                    sys.print('stderr: ' + stderr);
                    if(error !== null) {
                        console.log('exec error: ' + error);
                    } else {
                    
                        //do a pull origin of a terget branch 
                        exec('git pull origin ' + target_branch, function(error, stdout,stderr){
                            sys.print('stdout: ' + stdout);
                            sys.print('stderr: ' + stderr);
                            
                            // do a checkout of your previous branch
                            exec('git checkout ' + current_branch, function(error, stdout,stderr){
                                sys.puts(stdout);
                                
                                //merge the target branch;
                                exec('git merge ' + target_branch, puts);
                            });
                        })
                    }
                    
                });
                
            } else {
                console.log("No target branch for merge defined");
            }
            
        } else {
             console.log('exec error: ' + err);
        }
    });
    

Nice piece of code. Thanks frontmesh!

It does what it says it do ! Great job !