How to get the difference only additions between two files in linux

Question

I have two files A1 and A2  unsorted   A1 is previous version of A2 and some lines have been added to A2  How can I get the new lines that are added to A2    Note  I just want the new lines added and dont want the lines which were in A1 but deleted in A2  When i do diff A1 A2  I get the additions as well as deletions but I want only additions   Please suggest a way to do this

User · Answer

git diff path file css   grep -E         grep -v      b     cut -c 2-    grep -E       is from previous accepted answer  it is incomplete because leaves non-source stuff grep -v      b  removes non-source line with file name of later version cut -c 2- removes column of   signs  also may use sed  s          comm or sdiff were not an option because of git

User · Answer

diff and then grep for the edit type you want   diff -u A1 A2   grep -E

User · Answer

A similar approach to https   stackoverflow com a 15385080 337172 but hopefully more understandable and easy to tweak  diff     --new-line-format  quot  L quot      --old-line-format  quot  quot      --unchanged-line-format  quot  quot      A1 A2

User · Answer

The simple method is to use    sdiff A1 A2   Another method is to use comm  as you can see in Comparing two unsorted lists in linux  listing the unique in the second file

User · Answer

You can type   grep -v -f A1 A2

User · Answer

All of the below is copied directly from  TomOnTime s serverfault answer here   Show lines that only exist in file a   i e  what was deleted from a   comm -23 a b   Show lines that only exist in file b   i e  what was added to b   comm -13 a b   Show lines that only exist in one file or the other   but not both   comm -3 a b   sed  s   t       Warning  If file a has lines that start with TAB  it  the first TAB  will be removed from the output    NOTE  Both files need to be sorted for  comm  to work properly   If they aren t already sorted  you should sort them   sort  lt a  gt a sorted sort  lt b  gt b sorted comm -12 a sorted b sorted   If the files are extremely long  this may be quite a burden as it requires an extra copy and therefore twice as much disk space   Edit  note that the command can be written more concisely using process substitution  thanks to  phk for the comment    comm -12  lt  sort  lt  a   lt  sort  lt  b

User · Answer

You can try this  diff --changed-group-format    gt   --unchanged-group-format    A1 A2   The options are documented in man diff          --GTYPE-group-format GFMT               format GTYPE input groups with GFMT   and          LTYPE is  old    new   or  unchanged                 GTYPE is LTYPE or  changed     and                 GFMT  only  may contain            lt      lines from FILE1           gt      lines from FILE2

[linux] How to get the difference (only additions) between two files in linux

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