gors@well.UUCP (Gordon Stewart) (10/03/89)
Is it my imagination, or does AIX (RT) have its own idea of what file
compression means? Is there a way to uncompress standard .Z files
using AIX 2.2.1? If not, does anyone out there have a public domain version
of uncompress/zcat that I could have? I really would like to get at those
public domain sources which are stored in compressed format.
Thanks so much,
Karin Meyer
--
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(Doolan) | (Meyer) | (Castillo)clarke@acheron.uucp (Ed Clarke/10240000) (10/04/89)
From article <13906@well.UUCP>, by gors@well.UUCP (Gordon Stewart): > Is it my imagination, or does AIX (RT) have its own idea of what file > compression means? Is there a way to uncompress standard .Z files > using AIX 2.2.1? If not, does anyone out there have a public domain version > of uncompress/zcat that I could have? I really would like to get at those > public domain sources which are stored in compressed format. 'compress' does not come with AIX in any flavor. You might be looking at packed ( ends with a lower case .z instead of an upper case one ) instead of compressed format. It's quicker/easier to unpack a file rather than to uncompress it. As far as I know, only man pages are normally packed. The packed format is almost always larger than a compressed version. 'compress' is part of 'B' news. It compiles easily ( but needs the -a compile option ) and works on AIX. The source is 35k - see if you can get it locally, otherwise I can send it to you. There is an 'uncompress'(?) or something that comes with the PL8 compiler. That's something totally different that I'm not familiar with. -- Ed Clarke acheron!clarke
drake@ibmarc.uucp (Sam Drake) (10/04/89)
In article <13906@well.UUCP> gors@well.UUCP (Gordon Stewart) writes: >Is it my imagination, or does AIX (RT) have its own idea of what file >compression means? I think this is an AT&T-ism, not an AIX change. SysV provides the pack/unpack/pcat set of commands, while the BSD world has instead compress/uncompress/zcat. If you have access to a BSD source license, compress et al can be ported in a matter of minutes, but they aren't currently shipped with AIX/RT. Sam Drake / IBM Almaden Research Center
dyer@spdcc.COM (Steve Dyer) (10/06/89)
In article <1113@ks.UUCP> drake@ibmarc.UUCP (Sam Drake) writes: >I think this is an AT&T-ism, not an AIX change. SysV provides the >pack/unpack/pcat set of commands, while the BSD world has instead >compress/uncompress/zcat. If you have access to a BSD source license, >compress et al can be ported in a matter of minutes, but they aren't >currently shipped with AIX/RT. You certainly *DON'T* need a BSD source license. compress/etc. are available with the B News distribution as well as in the comp.sources archives available on UUNET. -- Steve Dyer dyer@ursa-major.spdcc.com aka {ima,harvard,rayssd,linus,m2c}!spdcc!dyer dyer@arktouros.mit.edu, dyer@hstbme.mit.edu
jim@applix.UUCP (Jim Morton) (10/06/89)
In article <1989Oct3.221135.21254@acheron.uucp>, Ed Clarke writes: > It's quicker/easier to unpack a file rather than to uncompress it. My immediate reaction was "no way!" but rather than shoot first, I tried both for a copy of a 745k unix kernel - a sample binary. Text files have more dramatic results in favor of compress. The results below show about twice as long to compress vs. pack, but around the same time to decompress vs. pack. Considering that in my experience compress ALWAYS gives smaller output size, I always use compress. Results: (RT model 125, AIX 2.2.1, 8meg memory) # ls -las unix* 1464 -r--r--r-- 1 root system 745892 Oct 6 10:27 unix.1 1464 -r--r--r-- 1 root system 745892 Oct 6 10:28 unix.2 # time pack unix.1 pack: unix.1: 18.3% Compression real 15.7 user 9.7 sys 1.0 # time compress -v unix.2 unix.2: 745892 chars in, 269927 codes (508253 bytes) out, compression 149.17% Compression as in compact: 32.11% Largest code (of last block) was 62532 (16 bits) real 43.0 user 31.8 sys 0.7 # ls -las unix* 1196 -r--r--r-- 1 root system 609483 Oct 6 10:27 unix.1.z 1000 -r--r--r-- 1 root system 508253 Oct 6 10:28 unix.2.Z # time unpack unix.1 unpack: unix.1: unpacked real 36.1 user 23.3 sys 2.5 # time compress -dv unix.2 unix.2.Z: -- replaced with unix.2 real 41.5 user 17.3 sys 1.8 -- Jim Morton, APPLiX Inc., Westboro, MA ...uunet!applix!jim jim@applix.com