mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-21 16:32:25 +01:00
36 lines
1.7 KiB
Plaintext
36 lines
1.7 KiB
Plaintext
Version 2.0:
|
|
|
|
The most important user visible change is that egrep and fgrep have
|
|
disappeared as separate programs into the single grep program mandated
|
|
by POSIX 1003.2. New options -G, -E, and -F have been added,
|
|
selecting grep, egrep, and fgrep behavior respectively. For
|
|
compatibility with historical practice, hard links named egrep and
|
|
fgrep are also provided. See the manual page for details.
|
|
|
|
In addition, the regular expression facilities described in Posix
|
|
draft 11.2 are now supported, except for internationalization features
|
|
related to locale-dependent collating sequence information.
|
|
|
|
There is a new option, -L, which is like -l except it lists
|
|
files which don't contain matches. The reason this option was
|
|
added is because '-l -v' doesn't do what you expect.
|
|
|
|
Performance has been improved; the amount of improvement is platform
|
|
dependent, but (for example) grep 2.0 typically runs at least 30% faster
|
|
than grep 1.6 on a DECstation using the MIPS compiler. Where possible,
|
|
grep now uses mmap() for file input; on a Sun 4 running SunOS 4.1 this
|
|
may cut system time by as much as half, for a total reduction in running
|
|
time by nearly 50%. On machines that don't use mmap(), the buffering
|
|
code has been rewritten to choose more favorable alignments and buffer
|
|
sizes for read().
|
|
|
|
Portability has been substantially cleaned up, and an automatic
|
|
configure script is now provided.
|
|
|
|
The internals have changed in ways too numerous to mention.
|
|
People brave enough to reuse the DFA matcher in other programs
|
|
will now have their bravery amply "rewarded", for the interface
|
|
to that file has been completely changed. Some changes were
|
|
necessary to track the evolution of the regex package, and since
|
|
I was changing it anyway I decided to do a general cleanup.
|