I have file1 and file2 as following. I would like to first find matches between two files based on first column and then print the matching lines from file1 and file2. I have written the desired output below

$ cat file1

1,      456,    abcd,  ...

23,     567,    rstc,  ...

45,     678,    rsto,  ...

$ cat file2

23,     5607,   abcstc, ...

45,     28,     zfgsto, ...

Desired output:

23,     567,    rstc,    ...

23,     5607,   abcstc,  ...

45,     678,    rsto,    ...

45,     28,     zfgsto,  ...