Dave Lawrence (11/10/88)
Okay, here's a segment of code that doesn't do exactly what everyone things
it should. It's for an csh-script.
set page = $<
echo $page $#page /* just for debugging
if ( $page == 'q' ) exit
man $page | less
If I give it 'plot' (no quotes, though), it does:
plot 1
[ plot manpage ]
If I give it 'q', it does:
q 1
[ clean exit ]
If I give it '5 plot', it does:
5 plot 1
if: expression syntax
child of tty exited with return code 1
If I take out the if statement, it still looks up the manpage for plot
as advertised, doesn't find one for q, as expected, and does:
5 plot 1
No manual page for 5 plot
Note that the last results are also gained by man $< | less and an
input of '5 plot'.
Now here's the rub. 'man 5 plot' typed in csh DOES provide the
requested manpage of plot(5). So it does exist.
Right now I have a UI kludge written to compensate for this apparent
bug, but I would rather not have it. I just want to be able to
type the manpage I want rather than tell it I need another section,
then type the section and then type the page, or even start off
with a case statement saying for a single number entered then branch
to ask for the page from that section.
Can someone please explain to me why this behave as it does and suggest
a fix? Any help would be appreciated.
AtDhVaAnNkCsE
Dave
--
g l o r i o u sex i s t e n c e
EMAIL: tale@rpitsmts.bitnet, tale%mts.rpi.edu@rpitsgw, tale@pawl.rpi.edu
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Path: psuvm.bitnhiebeler@rpics (Dave Hiebeler) (11/10/88)
In article <1698@imagine.PAWL.RPI.EDU> tale@pawl.rpi.edu writes: >Okay, here's a segment of code that doesn't do exactly what everyone things >it should. It's for an csh-script. > >set page = $< >echo $page $#page /* just for debugging >if ( $page == 'q' ) exit >man $page | less > >If I give it '5 plot', it does: >5 plot 1 >if: expression syntax >child of tty exited with return code 1 > I think you want your third line to read: if ( ${page[1]} == "q" ) exit (Note that just out of habit I use {} around variable-names, and double quotes around strings... you probably don't need them, but I'm not sure.) I think your problem was the if was getting expanded to: if ( 5 plot == 'q' ) exit ---- Dave Hiebeler Internet: hiebeler@cs.rpi.edu (preferred address) R.D. Box 225A userfrzk%mts@itsgw.rpi.edu Chatham, NY 12037 Bitnet: userfrzk@rpitsmts.bitnet "xue zai xao" "...I can't remember what I was going to say..."
chris@mimsy.UUCP (Chris Torek) (11/10/88)
[apologies for all the quoting; I could not trim much out] >In article <1698@imagine.PAWL.RPI.EDU> tale@pawl.rpi.edu writes: >>set page = $< >>echo $page $#page /* just for debugging >>if ( $page == 'q' ) exit >>man $page | less >> >>If I give it '5 plot', it does: >>5 plot 1 >>if: expression syntax >>child of tty exited with return code 1 In article <1702@imagine.PAWL.RPI.EDU> hiebeler@rpics (Dave Hiebeler) writes: > I think you want your third line to read: >if ( ${page[1]} == "q" ) exit This still fails. > (Note that just out of habit I use {} around variable-names, and double >quotes around strings... you probably don't need them, but I'm not sure.) You need the quotes, but not where you put them: > I think your problem was the if was getting expanded to: > if ( 5 plot == 'q' ) exit This is exactly the problem; to circumvent it, use if ("$page" == q) exit or if ($page:q == q) exit It is not necessary to quote the `q' that comes after the `==' in this case, since it contains no special characters. (It does not hurt to quote it, of course.) -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163) Domain: chris@mimsy.umd.edu Path: uunet!mimsy!chris