sort was there since v1
https://www.bell-labs.com/usr/dmr/www/man61.pdf

Fix typo (s/supress/suppress/).

Remove workaround for ancient HTML generation code.

Add missing full stop.

branches: 1.36.2;
Sort options and their descriptions. Sync usage more with man page.
Bump date in man page for new option -C.

Add the posix -C option (-c but quieter). Fix -R to work properly when
setting \n as the record delimited using a numeric value rather than literal
\n - and to not incorrectly turn \n into a field separator if -R is used to
make some other char the record separator (\n becomes a field separator in
that case as long as the field separator remains "white space" but should not
be in any other case - unless set explicitly of course.)

Plus more cosmetic changes - the man page and usage are updated to make it
more clear that the 2 (or 1) params to -k are not fields (field1 and field2)
but specifiers of the beginning and end of one key field. There was an
unused 'x' option in the GETOPTS string. The usage message is reformatted
to display properly on both 80 col and > 80 col displays (on < 80 it will
still probably look pretty ugly ... perhaps not quite so bad though), and
is also updated to show the different usage for the -c case (and -C) from the
others (only 1 file permitted) - the man page synopsis has a similar update.

Using more than one of -c -C or -m generates a usage message rather than
just ignoring the -m as it did before (there was no -C before of course).

Aside from the bug fix to the interaction between -R and -t, there are no
changes that affect the way anything is sorted (or read, or written).

Discussed on tech-userlevel earlier this week.

- Remove redundant argument to non-first `.Nm' macro;
- reference `-u' at `-c', to make more clear that the former can
be used with the latter;
- bump date.

From Bug Hunting.

While here, use Aq.

As from today, numeric fields may begin with an optional
plus or minus sign, not only an optional minus sign.

branches: 1.32.6; 1.32.12;
Sort sections.

Add an 'l' style for sorting that sorts by the string length of the field.

RETURN VALUES -> EXIT STATUS.

Fix pasto.

Bring nearer to reality.
Note that -H is now ignored.
Move -S and -s (and -H) to the first list of options since they are
global ones, not ones that override the ordering rules.

Don't workaround ancient macro argument limit with .Xo/.Xc.

branches: 1.26.6; 1.26.8; 1.26.12;
Move TNF licenses to 2 clause form

branches: 1.25.26;
Sort options in SYNOPSIS. From Kouichirou Hiratsuka in PR 26278.

add TNF copyright

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Pa Ar -> Ar.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

compatibility, not compatiblity.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Punctuation nits, sort SEE ALSO.

Add cross references for qsort(3), and radixsort(3), per PR 10567

Pull in various cosmetic changes from OpenBSD version of this manpage - mostly
whitespace changes, which don't influence the layout of result manpage at all,
but also add -H to SYNOPSIS and state sort(1) appeared in v5, not v6 of
AT&T Unix.

document -T and TMPDIR handling
resurrect ENVIRONMENT and FILES, adjust to be more correct
slighly adjust SYNOPSIS line, so that it looks little nicer :)

move sections so that the order is more like the one specified by
mdoc.samples(7)

use -R instead -w, to be compatible with OpenBSD

s/-T/-w/

set date to when this utility became default system sort(1) on NetBSD
add information about when it came to NetBSD to HISTORY

note this sort(1) implementation appeared in 4.4BSD

add -s/-S to synopsis
remove TMPDIR stuff - it no longer applies, at least for now
move the note about link/unlink from BUGS to NOTES
add note about trailing record separator and lack of restriction on
line length or allowed bytes

by default, use stable sort
add -S flag to switch to non-stable sort; for GNU sort compatibility,
provide -s flag too

fix up various .Nm abuses:
- keep the case consistent between the actual name and what's referenced.
e.g, if it's `foo', don't use '.Nm Foo' at the start of a sentence.
- remove unnecessary `.Nm foo' after the first occurrence (except for
using `.Nm ""' if there's stuff following, or for the 2nd and so on
occurrences in a SYNOPSIS
- use Sx, Ic, Li, Em, Sq, and Xr as appropriate

enlarge line buffer as necessary, so that it's possible
to process lines longer than 65522 characters
constify, rename MAXLLEN to DEFLLEN

HEAVY formatting cleanup.

Two classes of changes from the initial OpenBSD commit of this sort(1):
FILE * variables are called "fp" rather than "fd".
Better (safer) temporary-file handling.

Hit sort(1) with a hammer till it compiles.
Also add RCSIDs.

branches: 1.1.1;
Initial revision

Fix typo (s/supress/suppress/).

Remove workaround for ancient HTML generation code.

Add missing full stop.

branches: 1.36.2;
Sort options and their descriptions. Sync usage more with man page.
Bump date in man page for new option -C.

Add the posix -C option (-c but quieter). Fix -R to work properly when
setting \n as the record delimited using a numeric value rather than literal
\n - and to not incorrectly turn \n into a field separator if -R is used to
make some other char the record separator (\n becomes a field separator in
that case as long as the field separator remains "white space" but should not
be in any other case - unless set explicitly of course.)

Plus more cosmetic changes - the man page and usage are updated to make it
more clear that the 2 (or 1) params to -k are not fields (field1 and field2)
but specifiers of the beginning and end of one key field. There was an
unused 'x' option in the GETOPTS string. The usage message is reformatted
to display properly on both 80 col and > 80 col displays (on < 80 it will
still probably look pretty ugly ... perhaps not quite so bad though), and
is also updated to show the different usage for the -c case (and -C) from the
others (only 1 file permitted) - the man page synopsis has a similar update.

Using more than one of -c -C or -m generates a usage message rather than
just ignoring the -m as it did before (there was no -C before of course).

Aside from the bug fix to the interaction between -R and -t, there are no
changes that affect the way anything is sorted (or read, or written).

Discussed on tech-userlevel earlier this week.

- Remove redundant argument to non-first `.Nm' macro;
- reference `-u' at `-c', to make more clear that the former can
be used with the latter;
- bump date.

From Bug Hunting.

While here, use Aq.

As from today, numeric fields may begin with an optional
plus or minus sign, not only an optional minus sign.

branches: 1.32.6; 1.32.12;
Sort sections.

Add an 'l' style for sorting that sorts by the string length of the field.

RETURN VALUES -> EXIT STATUS.

Fix pasto.

Bring nearer to reality.
Note that -H is now ignored.
Move -S and -s (and -H) to the first list of options since they are
global ones, not ones that override the ordering rules.

Don't workaround ancient macro argument limit with .Xo/.Xc.

branches: 1.26.6; 1.26.8; 1.26.12;
Move TNF licenses to 2 clause form

branches: 1.25.26;
Sort options in SYNOPSIS. From Kouichirou Hiratsuka in PR 26278.

add TNF copyright

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Pa Ar -> Ar.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

compatibility, not compatiblity.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Punctuation nits, sort SEE ALSO.

Add cross references for qsort(3), and radixsort(3), per PR 10567

Pull in various cosmetic changes from OpenBSD version of this manpage - mostly
whitespace changes, which don't influence the layout of result manpage at all,
but also add -H to SYNOPSIS and state sort(1) appeared in v5, not v6 of
AT&T Unix.

document -T and TMPDIR handling
resurrect ENVIRONMENT and FILES, adjust to be more correct
slighly adjust SYNOPSIS line, so that it looks little nicer :)

move sections so that the order is more like the one specified by
mdoc.samples(7)

use -R instead -w, to be compatible with OpenBSD

s/-T/-w/

set date to when this utility became default system sort(1) on NetBSD
add information about when it came to NetBSD to HISTORY

note this sort(1) implementation appeared in 4.4BSD

add -s/-S to synopsis
remove TMPDIR stuff - it no longer applies, at least for now
move the note about link/unlink from BUGS to NOTES
add note about trailing record separator and lack of restriction on
line length or allowed bytes

by default, use stable sort
add -S flag to switch to non-stable sort; for GNU sort compatibility,
provide -s flag too

fix up various .Nm abuses:
- keep the case consistent between the actual name and what's referenced.
e.g, if it's `foo', don't use '.Nm Foo' at the start of a sentence.
- remove unnecessary `.Nm foo' after the first occurrence (except for
using `.Nm ""' if there's stuff following, or for the 2nd and so on
occurrences in a SYNOPSIS
- use Sx, Ic, Li, Em, Sq, and Xr as appropriate

enlarge line buffer as necessary, so that it's possible
to process lines longer than 65522 characters
constify, rename MAXLLEN to DEFLLEN

HEAVY formatting cleanup.

Two classes of changes from the initial OpenBSD commit of this sort(1):
FILE * variables are called "fp" rather than "fd".
Better (safer) temporary-file handling.

Hit sort(1) with a hammer till it compiles.
Also add RCSIDs.

branches: 1.1.1;
Initial revision

Remove workaround for ancient HTML generation code.

Add missing full stop.

branches: 1.36.2;
Sort options and their descriptions. Sync usage more with man page.
Bump date in man page for new option -C.

Add the posix -C option (-c but quieter). Fix -R to work properly when
setting \n as the record delimited using a numeric value rather than literal
\n - and to not incorrectly turn \n into a field separator if -R is used to
make some other char the record separator (\n becomes a field separator in
that case as long as the field separator remains "white space" but should not
be in any other case - unless set explicitly of course.)

Plus more cosmetic changes - the man page and usage are updated to make it
more clear that the 2 (or 1) params to -k are not fields (field1 and field2)
but specifiers of the beginning and end of one key field. There was an
unused 'x' option in the GETOPTS string. The usage message is reformatted
to display properly on both 80 col and > 80 col displays (on < 80 it will
still probably look pretty ugly ... perhaps not quite so bad though), and
is also updated to show the different usage for the -c case (and -C) from the
others (only 1 file permitted) - the man page synopsis has a similar update.

Using more than one of -c -C or -m generates a usage message rather than
just ignoring the -m as it did before (there was no -C before of course).

Aside from the bug fix to the interaction between -R and -t, there are no
changes that affect the way anything is sorted (or read, or written).

Discussed on tech-userlevel earlier this week.

- Remove redundant argument to non-first `.Nm' macro;
- reference `-u' at `-c', to make more clear that the former can
be used with the latter;
- bump date.

From Bug Hunting.

While here, use Aq.

As from today, numeric fields may begin with an optional
plus or minus sign, not only an optional minus sign.

branches: 1.32.6; 1.32.12;
Sort sections.

Add an 'l' style for sorting that sorts by the string length of the field.

RETURN VALUES -> EXIT STATUS.

Fix pasto.

Bring nearer to reality.
Note that -H is now ignored.
Move -S and -s (and -H) to the first list of options since they are
global ones, not ones that override the ordering rules.

Don't workaround ancient macro argument limit with .Xo/.Xc.

branches: 1.26.6; 1.26.8; 1.26.12;
Move TNF licenses to 2 clause form

branches: 1.25.26;
Sort options in SYNOPSIS. From Kouichirou Hiratsuka in PR 26278.

add TNF copyright

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Pa Ar -> Ar.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

compatibility, not compatiblity.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Punctuation nits, sort SEE ALSO.

Add cross references for qsort(3), and radixsort(3), per PR 10567

Pull in various cosmetic changes from OpenBSD version of this manpage - mostly
whitespace changes, which don't influence the layout of result manpage at all,
but also add -H to SYNOPSIS and state sort(1) appeared in v5, not v6 of
AT&T Unix.

document -T and TMPDIR handling
resurrect ENVIRONMENT and FILES, adjust to be more correct
slighly adjust SYNOPSIS line, so that it looks little nicer :)

move sections so that the order is more like the one specified by
mdoc.samples(7)

use -R instead -w, to be compatible with OpenBSD

s/-T/-w/

set date to when this utility became default system sort(1) on NetBSD
add information about when it came to NetBSD to HISTORY

note this sort(1) implementation appeared in 4.4BSD

add -s/-S to synopsis
remove TMPDIR stuff - it no longer applies, at least for now
move the note about link/unlink from BUGS to NOTES
add note about trailing record separator and lack of restriction on
line length or allowed bytes

by default, use stable sort
add -S flag to switch to non-stable sort; for GNU sort compatibility,
provide -s flag too

fix up various .Nm abuses:
- keep the case consistent between the actual name and what's referenced.
e.g, if it's `foo', don't use '.Nm Foo' at the start of a sentence.
- remove unnecessary `.Nm foo' after the first occurrence (except for
using `.Nm ""' if there's stuff following, or for the 2nd and so on
occurrences in a SYNOPSIS
- use Sx, Ic, Li, Em, Sq, and Xr as appropriate

enlarge line buffer as necessary, so that it's possible
to process lines longer than 65522 characters
constify, rename MAXLLEN to DEFLLEN

HEAVY formatting cleanup.

Two classes of changes from the initial OpenBSD commit of this sort(1):
FILE * variables are called "fp" rather than "fd".
Better (safer) temporary-file handling.

Hit sort(1) with a hammer till it compiles.
Also add RCSIDs.

branches: 1.1.1;
Initial revision

Add missing full stop.

Sort options and their descriptions. Sync usage more with man page.
Bump date in man page for new option -C.

Add the posix -C option (-c but quieter). Fix -R to work properly when
setting \n as the record delimited using a numeric value rather than literal
\n - and to not incorrectly turn \n into a field separator if -R is used to
make some other char the record separator (\n becomes a field separator in
that case as long as the field separator remains "white space" but should not
be in any other case - unless set explicitly of course.)

Plus more cosmetic changes - the man page and usage are updated to make it
more clear that the 2 (or 1) params to -k are not fields (field1 and field2)
but specifiers of the beginning and end of one key field. There was an
unused 'x' option in the GETOPTS string. The usage message is reformatted
to display properly on both 80 col and > 80 col displays (on < 80 it will
still probably look pretty ugly ... perhaps not quite so bad though), and
is also updated to show the different usage for the -c case (and -C) from the
others (only 1 file permitted) - the man page synopsis has a similar update.

Using more than one of -c -C or -m generates a usage message rather than
just ignoring the -m as it did before (there was no -C before of course).

Aside from the bug fix to the interaction between -R and -t, there are no
changes that affect the way anything is sorted (or read, or written).

Discussed on tech-userlevel earlier this week.

- Remove redundant argument to non-first `.Nm' macro;
- reference `-u' at `-c', to make more clear that the former can
be used with the latter;
- bump date.

From Bug Hunting.

While here, use Aq.

As from today, numeric fields may begin with an optional
plus or minus sign, not only an optional minus sign.

branches: 1.32.6; 1.32.12;
Sort sections.

Add an 'l' style for sorting that sorts by the string length of the field.

RETURN VALUES -> EXIT STATUS.

Fix pasto.

Bring nearer to reality.
Note that -H is now ignored.
Move -S and -s (and -H) to the first list of options since they are
global ones, not ones that override the ordering rules.

Don't workaround ancient macro argument limit with .Xo/.Xc.

branches: 1.26.6; 1.26.8; 1.26.12;
Move TNF licenses to 2 clause form

branches: 1.25.26;
Sort options in SYNOPSIS. From Kouichirou Hiratsuka in PR 26278.

add TNF copyright

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

Pa Ar -> Ar.

.Nm does not need a dummy argument ("") before punctuation or
for correct formatting of the SYNOPSIS any longer.

"Utilize" has exactly the same meaning as "use," but it is more
difficult to read and understand. Most manuals of English style
therefore say that you should use "use".

compatibility, not compatiblity.

Generate <>& symbolically. I'm avoiding .../dist/... directories for now.

Punctuation nits, sort SEE ALSO.

Add cross references for qsort(3), and radixsort(3), per PR 10567

Pull in various cosmetic changes from OpenBSD version of this manpage - mostly
whitespace changes, which don't influence the layout of result manpage at all,
but also add -H to SYNOPSIS and state sort(1) appeared in v5, not v6 of
AT&T Unix.

document -T and TMPDIR handling
resurrect ENVIRONMENT and FILES, adjust to be more correct
slighly adjust SYNOPSIS line, so that it looks little nicer :)

move sections so that the order is more like the one specified by
mdoc.samples(7)

use -R instead -w, to be compatible with OpenBSD

s/-T/-w/

set date to when this utility became default system sort(1) on NetBSD
add information about when it came to NetBSD to HISTORY

note this sort(1) implementation appeared in 4.4BSD

add -s/-S to synopsis
remove TMPDIR stuff - it no longer applies, at least for now
move the note about link/unlink from BUGS to NOTES
add note about trailing record separator and lack of restriction on
line length or allowed bytes

by default, use stable sort
add -S flag to switch to non-stable sort; for GNU sort compatibility,
provide -s flag too

fix up various .Nm abuses:
- keep the case consistent between the actual name and what's referenced.
e.g, if it's `foo', don't use '.Nm Foo' at the start of a sentence.
- remove unnecessary `.Nm foo' after the first occurrence (except for
using `.Nm ""' if there's stuff following, or for the 2nd and so on
occurrences in a SYNOPSIS
- use Sx, Ic, Li, Em, Sq, and Xr as appropriate

enlarge line buffer as necessary, so that it's possible
to process lines longer than 65522 characters
constify, rename MAXLLEN to DEFLLEN

HEAVY formatting cleanup.

Two classes of changes from the initial OpenBSD commit of this sort(1):
FILE * variables are called "fp" rather than "fd".
Better (safer) temporary-file handling.

Hit sort(1) with a hammer till it compiles.
Also add RCSIDs.

branches: 1.1.1;
Initial revision