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Various Topics on Perl
Perl - "perldoc problem on linux" in Programming Languages
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11-17-2004
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#11 |
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Re: perldoc problem on linux
> All those 3 works: > > perldoc -t GD | less > perldoc -t GD | more > perldoc -t GD | nroff > > but not this one (seen as I described earlier): > > perldoc -t GD That's because perldoc does something different when output goes to a tty versus being piped to a program. When being piped to a program, the text is sent to STDOUT as is. When -t STDOUT is true, it checks the environment variables PERLDOC_PAGER and PAGER (in that order) before trying 'more' or 'less'. echo "PAGER=$PAGER PERLDOC_PAGER=$PERLDOC_PAGER" ls -l $PAGER; ls -l $PERLDOC_PAGER setenv PAGER less # csh, tcsh export PAGER=less # bash perldoc perldoc |
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11-18-2004
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#12 |
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Re: perldoc problem on linux
> All those 3 works: > > perldoc -t GD | less > perldoc -t GD | more > perldoc -t GD | nroff > > but not this one (seen as I described earlier): > > perldoc -t GD > > I wonder which file/folder I should look at to "check permissions" as > Anno suggested? (I found all perl related man pages are in > /usr/share/man/man1 or man3, to which permissions are allowed for all > users, i.e. 755 or 644 for folders or files respectively). Maybe try setting your PERLDOCDEBUG environment variable, and then running perldoc. My version of perldoc contains: BEGIN { $^W = 1 if $ENV{'PERLDOCDEBUG'} } which might give more verbose output. |
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11-19-2004
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#13 |
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Re: perldoc problem on linux
> (Please DON'T top-post - it's considered rude) > On Wed, 17 Nov 2004 06:21:50 -0800, Zhiliang Hu wrote: > <snip> > > James Willmore's suggestion works: "perldoc -t WWW::Search | less" > -- > > Returns normal du***entation. However, without "less" it still returns > > nothing except login prompt (i.e. "perldoc -t WWW::Search"). > > > > I don't seem to comprehend where the problem is (is "pager" a utility to > > dispaly text like "less"/"more"?), could you suggest further? > > If you're on a *nix system, there is an environment setting for which > pager (more, less, some other paging application) to use for viewing > do***ents. > > To find out if this variable is set, type: > echo $PAGER > > If you get just the command line back, this setting is missing and *may* > cause a problem with viewing Perl do***entation. To set the variable to > something "sane", type: > (for BASH) > export PAGER=`which less` > (for CSH - I think ... I always seem to mess up the syntax because I try > to avoid using C-Shell) > setenv PAGER `which less` > > This sets the environment variable to use `less` as your pager. > > If this environment setting *is* set, then I'm not real sure what's going > on :-( My thinking is to check your permissions again - just to be sure. > On my system, they are set to ... > > -r-xr-xr-x 1 root root 203 Oct 17 00:15 /usr/bin/perldoc > > Past these directions, I'm not sure what else might be going on. > > HTH > > Jim I am sorry I didn't know the difference posting on top or bottom - I learn some custom here. Thanks Jim. Here is what I did: 1. UNIX> echo $PAGER PAGER: Undefined variable. (1st glitch seems to be here) 2. Put in my .cshrc: "setenv PAGER less" and sourced it. => "perldoc WWW::Search" still produced nothing but login prompt. Same with full path "setenv PAGER /usr/bin/less", while I see -rwxr-xr-x 1 root root 131724 Sep 1 2003 /usr/bin/less 3. I then tried to use "less" to see a file: UNIX> less my_txt_file => it shows nothing but login prompt :0 (2nd glitch seems to be here) But why "perldoc WWW:Search -t | less" works? Hmm.. Interesting. 4. Put in my .cshrc: "setenv PAGER more" => Now it works fine. Thanks everyone for great helps and I appreciate this learning curve. Something more to learn... Zhiliang |
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