document non literal string format

Enable WARNS=4 by default for usr.bin, except for:
awk bdes checknr compile_et error gss hxtool kgetcred kinit
klist ldd less lex locale login m4 man menuc mk_cmds
mklocale msgc openssl rpcgen rpcinfo sdiff spell ssh
string2key telnet tn3270 verify_krb5_conf xlint

branches: 1.2.30;
Add missing DPADD for LIBMATH

seq(1) - print sequences of numbers

seq(1): add more examples, improve wording

From OpenBSD via jmc@OpenBSD

fix typos, mainly in words minimum and maximum, but also few others.

- Default terminator to \n
- Don't print a trailing separator
Behavior now matches GNU seq (from Aram at tech-userlevel)

branches: 1.9.12; 1.9.14;
seq(1) first appeared in Research Unix 8th Edition, which was before Plan 9.
Generalise in stating that this version is not bug for bug compatible with other
implementations.
Bump date.
Via FreeBSD bug 181390 with feedback from Warren Block.

* Punctuation
* Create separate section with macro for EXIT STATUS
Patch supplied by Bug Hunting.

branches: 1.7.6; 1.7.12;
Fix valid_format() to be more careful about allowing only valid printf
formats.

Also, accept %a and %A, which are new since this logic was last updated,
and also allow %F even though it's not functionally different from %f.
Document these additions and bump date of man page.

Fixes PR 43355.

new sentence, new line

Remove clause 3 and 4 from TNF licenses

branches: 1.4.26;
Add missing 'by' in license attribution -- Thanks, wiz!

Add RCS Id; sort option(s) without arguments before options with,
in SYNOPSIS; add prompts in examples; sort format letters as option letters would be sorted.

Drop trailing whitespace.

seq(1) - print sequences of numbers

seq: be smarter when inferring precision from arguments

Use the most precisely specified argument to infer precision, not the
last one we happen to process.

branches: 1.14.2;
Bail if increment is too small for the precision to avoid an infinite loop.

Chose better number format.

seq.c: replace non-standard `\e` with standard compliant `\x1B`

- Default terminator to \n
- Don't print a trailing separator
Behavior now matches GNU seq (from Aram at tech-userlevel)

branches: 1.10.2; 1.10.4;
The sign is optional in an exponent

Treat numbers after [Ee] as a positive number rather than an invalid
numeric sequence. (Taken from FreeBSD but done differently.)

Fix typos (from FreeBSD)

Drop main() prototype.

Rerun valid_format() both before and after unescaping the format
string, in case the format string contains printf conversions
assembled from escape sequences.

A better approach might be to adjust the unescape logic to avoid
generating printf conversions (e.g. convert \x25 to %% instead of %)
but that's somewhat problematic and it's not really worth taking the
trouble.

Running valid_format() only after unescaping would also be somewhat
tidier but makes printing the invalid format string problematic,
because the unescape logic runs in place.

None of these cases are really worth worrying about in detail, but now
at least they don't result in SIGSEGV.

Related to PR 43355.

Fix valid_format() to be more careful about allowing only valid printf
formats.

Also, accept %a and %A, which are new since this logic was last updated,
and also allow %F even though it's not functionally different from %f.
Document these additions and bump date of man page.

Fixes PR 43355.

Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.

branches: 1.4.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.3.4;
Fix problem with handling escaped octal and hexadecimal sequences in the -f
format option. The problem is that the next character after such an escape
was not copied to the output.

branches: 1.2.18;
Sync usage with man page.

seq(1) - print sequences of numbers