CPAN.pm needs either the external programs tar, gzip and bzip2
 

just now,when i tried to install some perl modules for bugzilla,occurred one error,just like belows:

[root@localhost ~]# perl -MCPAN -e shell
Terminal does not support AddHistory.

cpan shell -- CPAN exploration and modules installation (v1.9205)
ReadLine support available (maybe install Bundle::CPAN or Bundle::CPANxxl?)

cpan> install PatchReader
Going to read /root/.cpan/Metadata
Database was generated on Wed, 24 Sep 2008 09:26:55 GMT
Running install for module 'PatchReader'
Running make for J/JK/JKEISER/PatchReader-0.9.5.tar.gz
Fetching with LWP:
http://ppm.activestate.com/CPAN/auth...r-0.9.5.tar.gz

CPAN: checksum security checks disabled because Digest::SHA not installed.
Please consider installing the Digest::SHA module.

Scanning cache /root/.cpan/build for sizes
............................................................................DONE
DEL(1/1): /root/.cpan/build/tmp-7225

CPAN.pm needs either the external programs tar, gzip and bzip2
installed. Can't continue.

cpan> install Digest::SHA
Running install for module 'Digest::SHA'
Running make for M/MS/MSHELOR/Digest-SHA-5.47.tar.gz
Fetching with LWP:
http://ppm.activestate.com/CPAN/auth...HA-5.47.tar.gz
CPAN: checksum security checks disabled because Digest::SHA not installed.

CPAN.pm needs either the external programs tar, gzip and bzip2
installed. Can't continue.

cpan>

====================================================
first question to be here,i am a freshman in linux,anyone can help me ,thanks a lot.

Well, that error would tell me that you don't have tar, gzip and bzip2 installed. Do you in fact have them installed? What distribution are you running?

The perl module "perl-Term-Readline-Gnu" seems missing.
http://search.cpan.org/dist/Term-ReadLine-Gnu/

Regards

thanks a lot for your reply first. but i am sure i have installed them.

thanks,i will try to test your op