Hello tybalt89, Thank you so much for your great help! The code is correct! A small question: How can 6 and 109521 separated with "Tab"? It looks they are separated with space. Thank you again and really appreciated! Best, Yue 
PeptideID    ProteinID    SpectrumID    Sequence
6    109521    53663    KMGEGR            
7    741    53663    KPPSGK            
11    681    144492    NNDALR            
11    780    144492    NNDALR            
20    2352    15547    SPAKPK            
27    1490    55547    LHKPPK            
27    1491    55547    LHKPPK            
27    1492    55547    LHKPPK            
28    51996    55547    LFVGRK            
29    1490    55504    LHKPPK            
29    1491    55504    LHKPPK            
29    1492    55504    LHKPPK            
30    1490    55602    LHKPPK            
30    1491    55602    LHKPPK            
30    1492    55602    LHKPPK

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In reply to Re^4: match two files by yueli711
in thread match two files by yueli711

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