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Thread-Topic: Cygwin making files inaccessible? 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C:\t>dir /s/b/a C:\t>dir /q . 02/05/2022 04:11 AM BUILTIN\Administrators . 02/05/2022 04:11 AM NT SERVICE\TrustedInsta.. C:\t>cacls . C:\t Everyone:(OI)(CI)F C:\t>echo > 1.txt C:\t>cacls 1.txt C:\t\1.txt Everyone:F C:\t>copy 1.txt 2.txt 1 file(s) copied. C:\t>cacls 2.txt C:\t\2.txt Everyone:F C:\t>del 2.txt C:\t>uname -a CYGWIN_NT-10.0-WOW DESKTOP-BCFUMJ4 3.3.4(0.341/5/3) 2022-01-31 19:31 i686 C= ygwin C:\t>cp 1.txt 2.txt C:\t>which cp /usr/bin/cp C:\t>cacls 2.txt C:\t\2.txt NULL SID:(DENY)(special access:) READ_CONTROL DESKTOP-BCFUMJ4\jay:(DENY)(special access:) FILE_READ_DATA FILE_READ_EA FILE_EXECUTE DESKTOP-BCFUMJ4\jay:(special access:) STANDARD_RIGHTS_ALL DELETE READ_CONTROL WRITE_DAC WRITE_OWNER SYNCHRONIZE STANDARD_RIGHTS_REQUIRED FILE_READ_ATTRIBUTES FILE_WRITE_ATTRIBUTES DESKTOP-BCFUMJ4\None:R Everyone:R C:\t>more 1.txt ECHO is on. C:\t>more 2.txt Cannot access file C:\t\2.txt Same behavior from cygwin64. C:\t>\cygwin64\bin\uname -a CYGWIN_NT-10.0 DESKTOP-BCFUMJ4 3.3.3(0.341/5/3) 2021-12-03 16:35 x86_64 Cyg= win Huh? I would hope Cygwin could/would just copy the ACLs asis. I am guessing there is some failed attempt to translate them to an internal form and then back to NT form. My real scenario was open/write/read, not cp.exe. - Jay