Add arguments to tail:
-q: suppress filename headers when multiple files are used
-v: print filename headers even when only one file is used

head already supports the same arguments, which originated in GNU head.
GNU tail also has the same flags.


Add tac, a hard link to 'tail -rq'.
Prints a file in reverse line order.

Similar to GNU tac, but lacking any options.

Add accompanying documentation.

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

Instead of declaring our own err() which is different than the standard one,
and using it incorrectly in a few places because of confusion (does it print
errno or not?), declare two versions following the standard ones xerrx and,
xerr, and use those as appropriate, implementing them using them vwarn and
vwarnx.

Fix WARNS=4 issues (-Wcast-qual -Wshadow -Wsign-compare)

XXX: need a "cleaner" way to do the check in reverse.c, as a general rule

branches: 1.8.42;
do not use long for file offset, use off_t. otto@openbsd

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

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

Remove #if __STDC__. De-__P() and ANSIfy.

More format string cleanup by sommerfeld.

branches: 1.4.8;
avoid repeated error messages by making bytes(), lines() and rlines() return
meaningful values, which can then be checked to avoid another error message.

branches: 1.3.8;
Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

PR/57850: Ricardo Branco: tail does not work in some pseudo-filesystems
From FreeBSD: https://github.com/NetBSD/src/pull/20

PR/50322: Timo Buhrmester: tail -F <file> misbehaves with stdin closed
Compare fp with stdin not fileno(fp) with STDIN_FILENO, because if tail
is called with 0 closed, then we are not going to be setting event filters
for the file because we'll erroneously think it is stdin.

fix unused variable warnings

branches: 1.31.2; 1.31.8;
minor knf, no functional change.

Instead of declaring our own err() which is different than the standard one,
and using it incorrectly in a few places because of confusion (does it print
errno or not?), declare two versions following the standard ones xerrx and,
xerr, and use those as appropriate, implementing them using them vwarn and
vwarnx.

Fix WARNS=4 issues (-Wcast-qual -Wshadow -Wsign-compare)

XXX: need a "cleaner" way to do the check in reverse.c, as a general rule

branches: 1.28.28;
Coverity CID 3204: The USE_SLEEP case can close the fp, and break does
not break from the loop, only from the switch. Make it break from the
loop to avoid a NULL pointer dereference.

branches: 1.27.2;
appease gcc -Wuninitialized

do not use long for file offset, use off_t. otto@openbsd

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

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

Use sleep(1) instead of usleep(1000000) to sleep for a second, since
usleep() doesn't support an argument >= 1000000.
Problem noted & fix provided in [bin/20644] from Dave Huang.

use kqueue to watch the file if possible
from FreeBSD via Luke Mewburn

this specifically does NOT include FreeBSD rev. 1.28 change; it's
my understanding -F is specifically meant to only detect removal
of the tailed file, not to watch for intermediate path changes

Update error message after recent changes.

Remove an old comment.

select() -> nanosleep()

Remove #if __STDC__. De-__P() and ANSIfy.

fix tail; don't try to map more of the file than really exists

make tail -f and tail -10000 work on files > those which can be mmap()ed whole. tail -r will still not function on large files.

avoid repeated error messages by making bytes(), lines() and rlines() return
meaningful values, which can then be checked to avoid another error message.

branches: 1.15.2;
KNF

Pacify gcc-2.8.1 (extra braces).

Remove tracking of file size by how many characters were output.
This succumbs to a race condition where data are written to the
file while the sleep is occurring. If a stat is done immediately
after, lastsize is updated but the file pointer wasn't pointing at
the end of the file, so the number of bytes between the current
pointer and the end of the file is added to the lastsize when
lastsize already points to the end of the file.

Use MAP_SHARED, not MAP_PRIVATE.

Add MAP_FILE as well.

Make sure mmap() uses MAP_PRIVATE instead of 0.

Add -F option to follow files though rotations and truncations.

WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Don't rely on select() not to modify the timeval argument. Also,
simplify the code by passing in NULL rather than an empty fd_set to
indicate no file descriptors.

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

munmap() mmap()ed regions.

various off_t fixes

off_t foo, and MAP_FILE

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

Instead of declaring our own err() which is different than the standard one,
and using it incorrectly in a few places because of confusion (does it print
errno or not?), declare two versions following the standard ones xerrx and,
xerr, and use those as appropriate, implementing them using them vwarn and
vwarnx.

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

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

Remove #if __STDC__. De-__P() and ANSIfy.

WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

minor knf, no functional change.

Instead of declaring our own err() which is different than the standard one,
and using it incorrectly in a few places because of confusion (does it print
errno or not?), declare two versions following the standard ones xerrx and,
xerr, and use those as appropriate, implementing them using them vwarn and
vwarnx.

Fix WARNS=4 issues (-Wcast-qual -Wshadow -Wsign-compare)

XXX: need a "cleaner" way to do the check in reverse.c, as a general rule

branches: 1.14.6;
Use off_t, not __off_t.

PR/37954: Thomas Klausner: "tail -c 2" broken.
It is not tail -c 2 but most of tail -c <n> with pipes. Fix by Anon Ymous

branches: 1.12.12;
Coverity CID 2986: Free lines before returning.

Coverity CID 1563: Fix memory leak.

safer use of realloc

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

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

Remove #if __STDC__. De-__P() and ANSIfy.

avoid repeated error messages by making bytes(), lines() and rlines() return
meaningful values, which can then be checked to avoid another error message.

branches: 1.6.2;
explicitly zero the lines structure! How did this ever work before?

WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

off_t foo, and MAP_FILE

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

minor knf, no functional change.

leave the original errno as it was. don't report EFBIG on all mmap failures.

Instead of declaring our own err() which is different than the standard one,
and using it incorrectly in a few places because of confusion (does it print
errno or not?), declare two versions following the standard ones xerrx and,
xerr, and use those as appropriate, implementing them using them vwarn and
vwarnx.

Fix WARNS=4 issues (-Wcast-qual -Wshadow -Wsign-compare)

XXX: need a "cleaner" way to do the check in reverse.c, as a general rule

branches: 1.19.30;
Duh fixed error printing.

Coverity CID 1580: Plug memory leak.

appease gcc -Wuninitialized on hp700.

do not use long for file offset, use off_t. otto@openbsd

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

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

Remove #if __STDC__. De-__P() and ANSIfy.

avoid C sequence point issues warned about by development version of gcc.

use %ll_ instead of the less standard %q_

avoid repeated error messages by making bytes(), lines() and rlines() return
meaningful values, which can then be checked to avoid another error message.

branches: 1.10.2;
Use MAP_SHARED, not MAP_PRIVATE.

Add MAP_FILE as well.

Make sure mmap() uses MAP_PRIVATE instead of 0.

WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

munmap() mmap()ed regions.

various off_t fixes

off_t foo, and MAP_FILE

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

Remove double 'each of'

Reported by Weitian LI liweitianux (DragonFly).

Remove some unnecessary words.

Add arguments to tail:
-q: suppress filename headers when multiple files are used
-v: print filename headers even when only one file is used

head already supports the same arguments, which originated in GNU head.
GNU tail also has the same flags.


Add tac, a hard link to 'tail -rq'.
Prints a file in reverse line order.

Similar to GNU tac, but lacking any options.

Add accompanying documentation.

Change back various occurrences of \*[Le], \*[Ge] (less/greater equal)
and \*(ua (upwards arrow) to literal "<=", ">=" and "^" whenever
appropriate (e.g., in code examples).

Nit-picking: avoid split infinitive

Sort options.

-qv are not specific to -r, so separate them.
Add -q and -v descriptions to the general option table.

Add arguments to tail:
-q: suppress filename headers when multiple files are used
-v: print filename headers even when only one file is used

head already supports the same arguments, which originated in GNU head.
GNU tail also has the same flags.


Add tac, a hard link to 'tail -rq'.
Prints a file in reverse line order.

Similar to GNU tac, but lacking any options.

Add accompanying documentation.

Add EXIT STATUS section. Use Ex.

Remove workaround for ancient HTML generation code.

Fix -f description: it is also ignored if stdin is a FIFO.
From Philip Guenther via jmc@openbsd.
Bump date.

branches: 1.14.6;
Add comma after i.e.
From Bug Hunting.

branches: 1.13.56; 1.13.62;
Move UCB-licensed code from 4-clause to 3-clause licence.

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

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

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

Sort sections.

Whitespace cleanup.

More and more .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Many more to
come.

Add bugs section noting that, with -F, tail can fail to detect a file
truncation. Also note that -F option is an extension.

Add -F option to follow files though rotations and truncations.

WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

Use ".St -p1003.2-92" macro instead of spelling it out.

Add RCS indentifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated

tail: adjust misleading indentation in macro. NFC.

[tail] Fix type of 'len'

ok pgoyette

branches: 1.19.2;
Sort options.

-qv are not specific to -r, so separate them.
Add -q and -v descriptions to the general option table.

Add arguments to tail:
-q: suppress filename headers when multiple files are used
-v: print filename headers even when only one file is used

head already supports the same arguments, which originated in GNU head.
GNU tail also has the same flags.


Add tac, a hard link to 'tail -rq'.
Prints a file in reverse line order.

Similar to GNU tac, but lacking any options.

Add accompanying documentation.

Add comma after i.e.
From Bug Hunting.

branches: 1.16.2; 1.16.8;
minor knf, no functional change.

Instead of declaring our own err() which is different than the standard one,
and using it incorrectly in a few places because of confusion (does it print
errno or not?), declare two versions following the standard ones xerrx and,
xerr, and use those as appropriate, implementing them using them vwarn and
vwarnx.

Fix WARNS=4 issues (-Wcast-qual -Wshadow -Wsign-compare)

XXX: need a "cleaner" way to do the check in reverse.c, as a general rule

branches: 1.13.6;
Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.

branches: 1.12.34;
do not use long for file offset, use off_t. otto@openbsd

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

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

minor KNF

Remove #if __STDC__. De-__P() and ANSIfy.

Add -F to usage, per bin/16558 by Ryan Younce.

Add { and } to shut up egcs. Reformat the more questionable code.

Add -F option to follow files though rotations and truncations.

WARNSify, fix .Nm usage, deprecate register, getopt returns -1 not EOF

Merged with 4.4lite.
Changed to conform to NetBSD's new RCS Id convention.

various off_t fixes

Add RCS identifiers.

branches: 1.1.1;
tail from ftp.uu.net:bsd-sources integrated