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CIsForCookies
Asked: 2018-12-10 05:02:45 +0800 CST

how to compare list of functions from 2 files?

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I wanted to list all functions in 2 files I have, so I used:

cat <file_A> | grep -E "^function"
cat <file_B> | grep -E "^function"

How can I compare the outputs and highlight the similarities?

command-line bash text-processing

2 Answers

  1. Best Answer

    Two options here:

    • if you need GUI solution - then you can use Meld Merge tool:

      sudo apt install meld

meld <(grep -E "^function" file_A) <(grep -E "^function" file_B)

    • if you need terminal solution - use power of diff:

      diff <(grep -E "^function" file_A) <(grep -E "^function" file_B)
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  2. You can use the process substitution functionality in this way:

    diff <(cat <file_A> | grep -E "^function") <(cat <file_B> | grep -E "^function")

    You do not need to use cat in this case. Also, there is a nice wrapper of diff called colordiff (it must be installed: sudo apt install colordiff). Here is one of my favorite usages:

    colordiff --side-by-side --left-column --width=180 --show-C-function <(grep -E "^function" <file_A>) <(grep -E "^function" <file_B>)
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