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[bug-diffutils] bug#24154: bug in 'diff -B'
From: |
Zieg, Mark (KSC-ESC-624)[VENCORE-ESC] |
Subject: |
[bug-diffutils] bug#24154: bug in 'diff -B' |
Date: |
Thu, 4 Aug 2016 21:43:45 +0000 |
Hello,
When diffing an empty file against a one-byte file using -B
(--ignore-blank-lines), diff incorrectly reports that the files are identical,
even though they aren't even the same size. The problem does not occur with
files of 2 bytes or longer. I tested this with diffutils 2.8, 3.2 and 3.3.
How to reproduce:
# create a one-byte file "foo"
deedwl262 [~/work/test] mzieg 09:17 PM $ echo -n x > foo
# create a zero-byte file "bar"
deedwl262 [~/work/test] mzieg 09:17 PM $ echo -n > bar
# confirm file sizes
deedwl262 [~/work/test] mzieg 09:18 PM $ ls -la
-rw-rw-r-- 1 mzieg unixusers 0 Aug 4 21:18 bar
-rw-rw-r-- 1 mzieg unixusers 1 Aug 4 21:17 foo
# verify "diff" works as expected
deedwl262 [~/work/test] mzieg 09:18 PM $ diff foo bar
1d0
< x
\ No newline at end of file
# verify "diff -w" works as expected
deedwl262 [~/work/test] mzieg 09:18 PM $ diff -w foo bar
1d0
< x
\ No newline at end of file
# verify "diff -b" works as expected
deedwl262 [~/work/test] mzieg 09:18 PM $ diff -b foo bar
1d0
< x
\ No newline at end of file
# HERE IS THE PROBLEM: diff -B does NOT work as expected
deedwl262 [~/work/test] mzieg 09:18 PM $ diff -B foo bar
# change "foo" to a 2-byte file
deedwl262 [~/work/test] mzieg 09:18 PM $ echo -n xy > foo
# now "diff -B" works as expected
deedwl262 [~/work/test] mzieg 09:19 PM $ diff -B foo bar
1d0
< xy
\ No newline at end of file
Regards,
Mark Zieg
address@hidden
- [bug-diffutils] bug#24154: bug in 'diff -B',
Zieg, Mark (KSC-ESC-624)[VENCORE-ESC] <=