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cmp: helpful EOF messages #766

Merged
merged 1 commit into from
Oct 21, 2024
Merged

cmp: helpful EOF messages #766

merged 1 commit into from
Oct 21, 2024

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mknos
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@mknos mknos commented Oct 21, 2024

  • It is easy to provide extra descriptive output when files differ at EOF, as done by GNU cmp
  • Shell scripts running cmp would normally use the -s flag and check the exit code, i.e. the text description shouldn't be depended on for portability
  • Also convert $chunk_size global to a constant because it doesn't vary
%dd if=/dev/urandom bs=512 count=1 of=rnd
%cp rnd rnd2
%echo >> rnd2
%touch empty
%perl cmp rnd rnd2 # test1: non-empty files, eof on arg1
cmp: EOF on rnd after byte 512, in line 6
%perl cmp rnd2 rnd # test2: non-empty files, eof on arg2
cmp: EOF on rnd after byte 512, in line 6
%perl cmp empty rnd # test3: arg1 empty
cmp: EOF on empty which is empty
%perl cmp rnd empty # test4: arg2 empty
cmp: EOF on empty which is empty

@mknos
cmp: helpful EOF messages
4d43343 
* It's trivial to provide extra descriptive output when files differ at EOF, as done by GNU cmp
* Shell scripts running cmp would normally use the -s flag and check the exit code, i.e. the text description shouldn't be depended upon for portability

%dd if=/dev/urandom bs=512 count=1 of=rnd
%cp rnd rnd2
%echo >> rnd2
%touch empty
%perl cmp rnd rnd2 # test1: non-empty files, eof on arg1
cmp: EOF on rnd after byte 512, in line 6
%perl cmp rnd2 rnd # test2: non-empty files, eof on arg2
cmp: EOF on rnd after byte 512, in line 6
%perl cmp empty rnd # test3: arg1 empty
cmp: EOF on empty which is empty
%perl cmp rnd empty # test4: arg2 empty
cmp: EOF on empty which is empty
@github-actions github-actions bot added Type: enhancement improve a feature that already exists Priority: low get to this whenever Program: cmp The cop program labels Oct 21, 2024
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:42 — with GitHub Actions Inactive
@mknos mknos temporarily deployed to automated_testing October 21, 2024 11:43 — with GitHub Actions Inactive
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coveralls commented Oct 21, 2024 •
edited
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Pull Request Test Coverage Report for Build 11439366106

Details

  • 0 of 0 changed or added relevant lines in 0 files are covered.
  • No unchanged relevant lines lost coverage.
  • Overall coverage decreased (-0.7%) to 73.069%
Totals Coverage Status
Change from base Build 11418850560: -0.7%
Covered Lines: 350
Relevant Lines: 479
💛 - Coveralls

@briandfoy briandfoy merged commit 715e441 into briandfoy:master Oct 21, 2024
22 of 23 checks passed
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changes: better messages when files differ at end of file

@briandfoy briandfoy removed the Priority: low get to this whenever label Oct 21, 2024
@briandfoy briandfoy added the Status: accepted The fix is accepted label Oct 21, 2024
@briandfoy briandfoy self-assigned this Oct 21, 2024
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Program: cmp The cop program Status: accepted The fix is accepted Type: enhancement improve a feature that already exists
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