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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] |
| Date | 2025-08-22 12:39 +0200 |
| Message-ID | <tvtlnlx5rc.ln2@Telcontar.valinor> (permalink) |
| References | (17 earlier) <1086snp$rgpt$19@dont-email.me> <ffgjnlxeqh.ln2@Telcontar.valinor> <10876rt$v4bp$1@dont-email.me> <359knlxqhi.ln2@Telcontar.valinor> <1089di2$1f8lv$3@dont-email.me> |
On 2025-08-22 11:33, Nuno Silva wrote:
> On 2025-08-21, Carlos E.R. wrote:
>> On 2025-08-21 15:27, Nuno Silva wrote:
>>> On 2025-08-21, Carlos E.R. wrote:
>>>> On 2025-08-21 12:34, The Natural Philosopher wrote:
>>>>> On 21/08/2025 10:44, Carlos E.R. wrote:
>>>>>> I do not want reference documentation.
>>>>>>
>>>>>> I primarily want documentation that allows me to start using a new
>>>>>> program, fast, and to achieve my goals.
>>>>>>
>>>>>> Once I have that, I want the reference documentation.
>>>>>
>>>>> +1001
>>> [...]
>>>> To that I added "bird.avi" as output file, but WhatsApp rejected
>>>> it. So I told ChatGpt all that. It replied giving me the missing data:
>>>>
>>>> ffmpeg -i IMAG0009.avi -vf "scale=640:-2" -c:v libx264 -profile:v \
>>>> baseline -level 3.0 -preset fast -c:a aac -b:a 128k \
>>>> -movflags +faststart bird_whatsapp.mp4
>>>>
>>>> and that worked. Having that command line, I modified it easily for
>>>> more resolution (scale=1024:-2). I was already familiar with all the
>>>> options, I just needed to find which would produce the wanted result,
>>>> and not spend a day on it.
>>>>
>>>>
>>>> But if I want to find in the manual what "-b" stands for, I fail. Ask
>>>> chatgpt, instant reply, it is bitrate. Oh, yes, I remember now.
>>>>
>>>> :-)
>>>>
>>>>
>>>> Oh, searching the man for "movflags" or "faststart" fails. So ask the
>>>> AI. They are in the man page for the MP3 muxer, it says. Oh, right, I
>>>> forgot that.
>>>>
>>>>
>>>> So, even a reference manual is hard to use when you want to find a
>>>> particular reference, basically using "grep".
>>>
>>> (ffmpeg's online manual is spread over more than one page, isn't it?)
>>
>> Yes.
>>
>> I don't know right now if there is a command that would search all
>> manuals and find a word.
>>
>> cer@Telcontar:~> apropos movflags
>> movflags: nothing appropriate.
>> cer@Telcontar:~>
>
> At least here, perhaps "man -w -K movflags". Turns up ffmpeg-all and ffmpeg-formats.
>
cer@Telcontar:~> time man -w -K movflags
/usr/share/man/man1/ffserver-all.1.gz
/usr/share/man/man1/ffmpeg-all.1.gz
/usr/share/man/man1/ffmpeg-formats.1.gz
real 0m52,869s
user 0m31,563s
sys 0m29,066s
cer@Telcontar:~>
Hum. New command. Long version:
man --where --path --location --global-apropos movflags
-w, --where, --path, --location
Don't actually display the manual pages,
but do print the location(s) of the
source nroff files that would be format-
ted.
-k, --apropos
Equivalent to apropos. Search the short
manual page descriptions for keywords
and display any matches. See apropos(1)
for details.
-K, --global-apropos
Search for text in all manual pages.
This is a brute-force search, and is
likely to take some time; if you can,
you should specify a section to reduce
the number of pages that need to be
searched. Search terms may be simple
strings (the default), or regular ex-
pressions if the --regex option is used.
Note that this searches the sources of
the manual pages, not the rendered text,
and so may include false positives due
to things like comments in source files.
Searching the rendered text would be
much slower.
I don't see how I could replicate this with the apropos command :-?
apropos - search the manual page names and descriptions
so, not the bodies.
> (But no, I wasn't aware of this, had to check "man man", so maybe
> there's some better man flag, or separate utility that I'm not aware of
> (besides plain grep on the man pages where possible, I guess).)
>
Maybe. I seem to recall having done this before, but perhaps not.
--
Cheers, Carlos.
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Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-19 12:35 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-19 12:18 +0100
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Marc Haber <mh+usenetspam1118@zugschl.us> - 2025-08-19 15:16 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:02 +0000
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Mike Scott <usenet.16@scottsonline.org.uk.invalid> - 2025-08-27 06:56 +0100
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 01:01 +0000
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-20 12:52 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:36 +0000
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 11:44 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use The Natural Philosopher <tnp@invalid.invalid> - 2025-08-21 11:34 +0100
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 14:36 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-21 14:27 +0100
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 21:37 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Nuno Silva <nunojsilva@invalid.invalid> - 2025-08-22 10:33 +0100
Manuals [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:39 +0200
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:12 +0000
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-22 01:06 +0000
Documentation [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-22 12:26 +0200
Re: Documentation [Was: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:13 +0000
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use John Ames <commodorejohn@gmail.com> - 2025-08-20 07:47 -0700
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-20 22:37 +0000
Re: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-20 19:25 +0000
tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-21 12:04 +0200
Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-23 12:40 +0000
Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] "Carlos E.R." <robin_listas@es.invalid> - 2025-08-24 00:40 +0200
Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-23 23:15 +0000
Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Stéphane CARPENTIER <sc@fiat-linux.fr> - 2025-08-24 11:22 +0000
Re: tldr [WAS: Yes, You Need A Firewall On Linux - Here’s Why And Which To Use] Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-08-24 22:18 +0000
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