We can use the
diff command to compare files line by line with a richer set of output formats than we did with
Simply pass in the two file names as the arguments to the
$ cat file1.txt
Life goals 1) Graduate High School 2) Go skydiving 3) Help and feed the poor and hungry 4) Run a half marathon 5) Swim at the beach 6) Travel to Ireland 7) Get rock solid abs
$ cat file2.txt
Life bucket list 1) Graduate college 2) Go skydiving 3) Help and feed the poor 4) Run a marathon 5) Swim at the beach 6) Travel the world
$ diff file1.txt file2.txt
1,2c1,2 < Life goals < 1) Graduate High School --- > Life bucket list > 1) Graduate college 4,5c4,5 < 3) Help and feed the poor and hungry < 4) Run a half marathon --- > 3) Help and feed the poor > 4) Run a marathon 7,8c7 < 6) Travel to Ireland < 7) Get rock solid abs --- > 6) Travel the world
The output will tell you how to change the first file to get the second file. Lines beginning with a < mean that they're from the first file, while the > mean they're from the second. The --- signifies separation of file1.txt and file2.txt.
There are three letters that signify three types of changes:
Thus in our example above, the
diff command tells us to change lines 1,2 from the file1.txt to lines 1,2 in the second file. The same for lines 4 and 5 (line 3 requires no change). Then it tells us to change lines 7,8 to just line 7 of file2.txt.
-u option, we can avoid redundant information. Again, the output will show you how to go from the first argument file to the second.
Here are a list of symbols used in unified mode.
$ diff -u file1.txt file2.txt
--- file1.txt 2015-06-03 22:34:30.000000000 -0700 +++ file2.txt 2015-06-03 22:38:26.000000000 -0700 @@ -1,8 +1,8 @@ -Life goals -1) Graduate High School +Life bucket list +1) Graduate college 2) Go skydiving -3) Help and feed the poor and hungry -4) Run a half marathon +3) Help and feed the poor +4) Run a marathon 5) Swim at the beach -6) Travel to Ireland -7) Get rock solid abs +6) Travel the world +
These a few common options used with the
diff command. Make sure you check the
man page for a complete listing.
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