Commit | Line | Data |
---|---|---|
a0d0e21e LW |
1 | =head1 NAME |
2 | ||
095a5c3e | 3 | perl - The Perl 5 language interpreter |
a0d0e21e LW |
4 | |
5 | =head1 SYNOPSIS | |
6 | ||
df451b2a RGS |
7 | B<perl> S<[ B<-sTtuUWX> ]> |
8 | S<[ B<-hv> ] [ B<-V>[:I<configvar>] ]> | |
9 | S<[ B<-cw> ] [ B<-d>[B<t>][:I<debugger>] ] [ B<-D>[I<number/list>] ]> | |
10 | S<[ B<-pna> ] [ B<-F>I<pattern> ] [ B<-l>[I<octal>] ] [ B<-0>[I<octal/hexadecimal>] ]> | |
11 | S<[ B<-I>I<dir> ] [ B<-m>[B<->]I<module> ] [ B<-M>[B<->]I<'module...'> ] [ B<-f> ]> | |
df451b2a | 12 | S<[ B<-C [I<number/list>] >]> |
df451b2a RGS |
13 | S<[ B<-S> ]> |
14 | S<[ B<-x>[I<dir>] ]> | |
15 | S<[ B<-i>[I<extension>] ]> | |
eb1dd64e | 16 | S<[ [B<-e>|B<-E>] I<'command'> ] [ B<--> ] [ I<programfile> ] [ I<argument> ]...> |
c07a80fd | 17 | |
b28fe7ca JL |
18 | For more information on these options, you can run C<perldoc perlrun>. |
19 | ||
6b43eec4 DG |
20 | =head1 GETTING HELP |
21 | ||
22 | The F<perldoc> program gives you access to all the documentation that comes | |
23 | with Perl. You can get more documentation, tutorials and community support | |
71c89d21 | 24 | online at L<https://www.perl.org/>. |
6b43eec4 DG |
25 | |
26 | If you're new to Perl, you should start by running C<perldoc perlintro>, | |
27 | which is a general intro for beginners and provides some background to help | |
28 | you navigate the rest of Perl's extensive documentation. Run C<perldoc | |
29 | perldoc> to learn more things you can do with F<perldoc>. | |
10151d09 JH |
30 | |
31 | For ease of access, the Perl manual has been split up into several sections. | |
a0d0e21e | 32 | |
0aef0fe5 NC |
33 | =begin buildtoc |
34 | ||
35 | # This section is parsed by Porting/pod_lib.pl for use by pod/buildtoc etc | |
36 | ||
37 | flag =g perluniprops perlmodlib perlapi perlintern | |
38 | flag =go perltoc | |
39 | flag =ro perlcn perljp perlko perltw | |
40 | flag = perlvms | |
41 | ||
0eb29def S |
42 | path perlfaq.* cpan/perlfaq/lib/ |
43 | path perlglossary cpan/perlfaq/lib/ | |
44 | path perlxs(?:tut|typemap)? dist/ExtUtils-ParseXS/lib/ | |
cb1974ba | 45 | path perldoc cpan/Pod-Perldoc/ |
0aef0fe5 | 46 | |
2560602c | 47 | aux h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp |
0aef0fe5 NC |
48 | |
49 | =end buildtoc | |
50 | ||
fd7b6849 MJD |
51 | =head2 Overview |
52 | ||
fb9cefb4 | 53 | perl Perl overview (this section) |
10151d09 | 54 | perlintro Perl introduction for beginners |
b28fe7ca | 55 | perlrun Perl execution and options |
fb9cefb4 | 56 | perltoc Perl documentation table of contents |
760ac839 | 57 | |
fd7b6849 MJD |
58 | =head2 Tutorials |
59 | ||
7a2320f0 AMS |
60 | perlreftut Perl references short introduction |
61 | perldsc Perl data structures intro | |
62 | perllol Perl data structures: arrays of arrays | |
7a2320f0 | 63 | |
41630250 | 64 | perlrequick Perl regular expressions quick start |
7a2320f0 AMS |
65 | perlretut Perl regular expressions tutorial |
66 | ||
82e1c0d9 | 67 | perlootut Perl OO tutorial for beginners |
7a2320f0 | 68 | |
da096611 RGS |
69 | perlperf Perl Performance and Optimization Techniques |
70 | ||
7a2320f0 AMS |
71 | perlstyle Perl style guide |
72 | ||
41630250 | 73 | perlcheat Perl cheat sheet |
7a2320f0 AMS |
74 | perltrap Perl traps for the unwary |
75 | perldebtut Perl debugging tutorial | |
76 | ||
fd7b6849 MJD |
77 | perlfaq Perl frequently asked questions |
78 | perlfaq1 General Questions About Perl | |
79 | perlfaq2 Obtaining and Learning about Perl | |
80 | perlfaq3 Programming Tools | |
81 | perlfaq4 Data Manipulation | |
82 | perlfaq5 Files and Formats | |
83 | perlfaq6 Regexes | |
84 | perlfaq7 Perl Language Issues | |
85 | perlfaq8 System Interaction | |
86 | perlfaq9 Networking | |
0f542199 | 87 | |
fd7b6849 | 88 | =head2 Reference Manual |
413510b3 | 89 | |
fb9cefb4 | 90 | perlsyn Perl syntax |
4755096e | 91 | perldata Perl data structures |
fb9cefb4 | 92 | perlop Perl operators and precedence |
c2e66d9e | 93 | perlsub Perl subroutines |
fd7b6849 | 94 | perlfunc Perl built-in functions |
413510b3 | 95 | perlopentut Perl open() tutorial |
41630250 | 96 | perlpacktut Perl pack() and unpack() tutorial |
c2e66d9e | 97 | perlpod Perl plain old documentation |
41630250 | 98 | perlpodspec Perl plain old documentation format specification |
4fb67a97 | 99 | perldocstyle Perl style guide for core docs |
f4d47668 | 100 | perlpodstyle Perl POD style guide |
c2e66d9e | 101 | perldiag Perl diagnostic messages |
9021a1cf | 102 | perldeprecation Perl deprecations |
41630250 | 103 | perllexwarn Perl warnings and their control |
4755096e | 104 | perldebug Perl debugging |
fb9cefb4 | 105 | perlvar Perl predefined variables |
4755096e | 106 | perlre Perl regular expressions, the rest of the story |
8a118206 RGS |
107 | perlrebackslash Perl regular expression backslash sequences |
108 | perlrecharclass Perl regular expression character classes | |
30487ceb | 109 | perlreref Perl regular expressions quick reference |
d396a558 | 110 | perlref Perl references, the rest of the story |
fb9cefb4 | 111 | perlform Perl formats |
d396a558 | 112 | perlobj Perl objects |
d396a558 | 113 | perltie Perl objects hidden behind simple variables |
fd7b6849 | 114 | perldbmfilter Perl DBM filters |
760ac839 | 115 | |
c2e66d9e GS |
116 | perlipc Perl interprocess communication |
117 | perlfork Perl fork() information | |
118 | perlnumber Perl number semantics | |
53d7eaa8 | 119 | |
c2e66d9e GS |
120 | perlthrtut Perl threads tutorial |
121 | ||
122 | perlport Perl portability guide | |
d396a558 | 123 | perllocale Perl locale support |
07fcf8ff | 124 | perluniintro Perl Unicode introduction |
41630250 | 125 | perlunicode Perl Unicode support |
5dd47fd4 | 126 | perlunicook Perl Unicode cookbook |
3426ea3d | 127 | perlunifaq Perl Unicode FAQ |
0cb5a9a8 | 128 | perluniprops Index of Unicode properties in Perl |
aadaa455 | 129 | perlunitut Perl Unicode tutorial |
d396a558 | 130 | perlebcdic Considerations for running Perl on EBCDIC platforms |
c2e66d9e | 131 | |
d396a558 | 132 | perlsec Perl security |
b135fd4a | 133 | perlsecpolicy Perl security report handling policy |
4755096e | 134 | |
c2e66d9e | 135 | perlmod Perl modules: how they work |
35bf961c JH |
136 | perlmodlib Perl modules: how to write and use |
137 | perlmodstyle Perl modules: how to write modules with style | |
fd7b6849 | 138 | perlmodinstall Perl modules: how to install from CPAN |
c2e66d9e | 139 | perlnewmod Perl modules: preparing a new module for distribution |
a550ee30 | 140 | perlpragma Perl modules: writing a user pragma |
760ac839 | 141 | |
fd7b6849 | 142 | perlutil utilities packaged with the Perl distribution |
760ac839 | 143 | |
fd7b6849 MJD |
144 | perlfilter Perl source filters |
145 | ||
4000c4db FC |
146 | perldtrace Perl's support for DTrace |
147 | ||
97a1d740 YST |
148 | perlglossary Perl Glossary |
149 | ||
fd7b6849 MJD |
150 | =head2 Internals and C Language Interface |
151 | ||
fb9cefb4 | 152 | perlembed Perl ways to embed perl in your C or C++ application |
41630250 | 153 | perldebguts Perl debugging guts and tips |
fb9cefb4 | 154 | perlxstut Perl XS tutorial |
4755096e | 155 | perlxs Perl XS application programming interface |
0eb29def | 156 | perlxstypemap Perl XS C/Perl type conversion tools |
f40a6c71 | 157 | perlclib Internal replacements for standard C library functions |
fb9cefb4 GS |
158 | perlguts Perl internal functions for those doing extensions |
159 | perlcall Perl calling conventions from C | |
15932acc | 160 | perlmroapi Perl method resolution plugin interface |
108003db | 161 | perlreapi Perl regular expression plugin interface |
b23a565d | 162 | perlreguts Perl regular expression engine internals |
fd7b6849 | 163 | |
954c1994 GS |
164 | perlapi Perl API listing (autogenerated) |
165 | perlintern Perl internal functions (autogenerated) | |
dc5c060f | 166 | perliol C API for Perl's implementation of IO in Layers |
4755096e | 167 | perlapio Perl internal IO abstraction interface |
fd7b6849 | 168 | |
e8cd7eae | 169 | perlhack Perl hackers guide |
04c692a8 | 170 | perlsource Guide to the Perl source tree |
1c2e8cca | 171 | perlinterp Overview of the Perl interpreter source and how it works |
04c692a8 DR |
172 | perlhacktut Walk through the creation of a simple C code patch |
173 | perlhacktips Tips for Perl core C code hacking | |
cb8a010e | 174 | perlpolicy Perl development policies |
f8e911a1 | 175 | perlgov Perl Rules of Governance |
04c692a8 | 176 | perlgit Using git with the Perl repository |
4755096e | 177 | |
d1690fb1 | 178 | =head2 History |
2a551100 | 179 | |
fb9cefb4 | 180 | perlhist Perl history records |
bdfb6cc8 | 181 | perldelta Perl changes since previous version |
78684fb7 | 182 | perl53510delta Perl changes in version 5.35.10 |
d84985bf | 183 | perl5359delta Perl changes in version 5.35.9 |
9d30331d | 184 | perl5358delta Perl changes in version 5.35.8 |
1ee7332f | 185 | perl5357delta Perl changes in version 5.35.7 |
2fac577b | 186 | perl5356delta Perl changes in version 5.35.6 |
6247a13a | 187 | perl5355delta Perl changes in version 5.35.5 |
74f6ed49 | 188 | perl5354delta Perl changes in version 5.35.4 |
73a058ad | 189 | perl5353delta Perl changes in version 5.35.3 |
9e71a8df | 190 | perl5352delta Perl changes in version 5.35.2 |
b7d6a4ec | 191 | perl5351delta Perl changes in version 5.35.1 |
9623941f | 192 | perl5350delta Perl changes in version 5.35.0 |
72e43cdf | 193 | perl5341delta Perl changes in version 5.34.1 |
b129a266 | 194 | perl5340delta Perl changes in version 5.34.0 |
1d0cdb1d | 195 | perl5321delta Perl changes in version 5.32.1 |
0382c61d | 196 | perl5320delta Perl changes in version 5.32.0 |
189c2812 | 197 | perl5303delta Perl changes in version 5.30.3 |
fb01b0b0 | 198 | perl5302delta Perl changes in version 5.30.2 |
9f26aead | 199 | perl5301delta Perl changes in version 5.30.1 |
5560f8d2 | 200 | perl5300delta Perl changes in version 5.30.0 |
189c2812 | 201 | perl5283delta Perl changes in version 5.28.3 |
bea9954d | 202 | perl5282delta Perl changes in version 5.28.2 |
43323ad1 | 203 | perl5281delta Perl changes in version 5.28.1 |
b0394755 | 204 | perl5280delta Perl changes in version 5.28.0 |
43323ad1 | 205 | perl5263delta Perl changes in version 5.26.3 |
fb51aa58 | 206 | perl5262delta Perl changes in version 5.26.2 |
c592f515 | 207 | perl5261delta Perl changes in version 5.26.1 |
b5cbfe35 | 208 | perl5260delta Perl changes in version 5.26.0 |
fb51aa58 | 209 | perl5244delta Perl changes in version 5.24.4 |
c592f515 | 210 | perl5243delta Perl changes in version 5.24.3 |
50d330d7 | 211 | perl5242delta Perl changes in version 5.24.2 |
f4a48a9e | 212 | perl5241delta Perl changes in version 5.24.1 |
4b8803f0 | 213 | perl5240delta Perl changes in version 5.24.0 |
50d330d7 | 214 | perl5224delta Perl changes in version 5.22.4 |
f4a48a9e | 215 | perl5223delta Perl changes in version 5.22.3 |
2f7cab8b | 216 | perl5222delta Perl changes in version 5.22.2 |
fd5868f3 | 217 | perl5221delta Perl changes in version 5.22.1 |
2cfe9b50 | 218 | perl5220delta Perl changes in version 5.22.0 |
9fd420ca | 219 | perl5203delta Perl changes in version 5.20.3 |
2b85b119 | 220 | perl5202delta Perl changes in version 5.20.2 |
0c54b9fe | 221 | perl5201delta Perl changes in version 5.20.1 |
d1148309 | 222 | perl5200delta Perl changes in version 5.20.0 |
e990b849 | 223 | perl5184delta Perl changes in version 5.18.4 |
7b97958f | 224 | perl5182delta Perl changes in version 5.18.2 |
f4e35152 | 225 | perl5181delta Perl changes in version 5.18.1 |
f13a3008 | 226 | perl5180delta Perl changes in version 5.18.0 |
eaf7bcbf | 227 | perl5163delta Perl changes in version 5.16.3 |
d1148309 AP |
228 | perl5162delta Perl changes in version 5.16.2 |
229 | perl5161delta Perl changes in version 5.16.1 | |
05c8f9ed | 230 | perl5160delta Perl changes in version 5.16.0 |
1e5cc764 | 231 | perl5144delta Perl changes in version 5.14.4 |
70ce046e | 232 | perl5143delta Perl changes in version 5.14.3 |
77efd0f7 | 233 | perl5142delta Perl changes in version 5.14.2 |
10288c7a | 234 | perl5141delta Perl changes in version 5.14.1 |
066dc4d9 | 235 | perl5140delta Perl changes in version 5.14.0 |
a5caed3e | 236 | perl5125delta Perl changes in version 5.12.5 |
0b67f426 | 237 | perl5124delta Perl changes in version 5.12.4 |
6c5f5efa | 238 | perl5123delta Perl changes in version 5.12.3 |
e71d1a7d | 239 | perl5122delta Perl changes in version 5.12.2 |
bdfb6cc8 | 240 | perl5121delta Perl changes in version 5.12.1 |
20d57231 | 241 | perl5120delta Perl changes in version 5.12.0 |
7cdf958d | 242 | perl5101delta Perl changes in version 5.10.1 |
7120b314 | 243 | perl5100delta Perl changes in version 5.10.0 |
fc5be808 | 244 | perl589delta Perl changes in version 5.8.9 |
c11a53c6 | 245 | perl588delta Perl changes in version 5.8.8 |
315ba985 | 246 | perl587delta Perl changes in version 5.8.7 |
e4bb216d | 247 | perl586delta Perl changes in version 5.8.6 |
07e9b5fe | 248 | perl585delta Perl changes in version 5.8.5 |
5f15c94e | 249 | perl584delta Perl changes in version 5.8.4 |
2e038148 NC |
250 | perl583delta Perl changes in version 5.8.3 |
251 | perl582delta Perl changes in version 5.8.2 | |
b6235c4f | 252 | perl581delta Perl changes in version 5.8.1 |
2e038148 | 253 | perl58delta Perl changes in version 5.8.0 |
493a87da | 254 | perl561delta Perl changes in version 5.6.1 |
41630250 | 255 | perl56delta Perl changes in version 5.6 |
4755096e GS |
256 | perl5005delta Perl changes in version 5.005 |
257 | perl5004delta Perl changes in version 5.004 | |
d516a115 | 258 | |
d1690fb1 DB |
259 | =head2 Miscellaneous |
260 | ||
261 | perlbook Perl book information | |
262 | perlcommunity Perl community information | |
263 | ||
264 | perldoc Look up Perl documentation in Pod format | |
265 | ||
42e73e1c | 266 | perlexperiment A listing of experimental features in Perl |
267 | ||
2a551100 JH |
268 | perlartistic Perl Artistic License |
269 | perlgpl GNU General Public License | |
270 | ||
d8416318 JH |
271 | =head2 Language-Specific |
272 | ||
0aef0fe5 NC |
273 | =for buildtoc flag +r |
274 | ||
fadae0ba | 275 | perlcn Perl for Simplified Chinese (in UTF-8) |
d8416318 JH |
276 | perljp Perl for Japanese (in EUC-JP) |
277 | perlko Perl for Korean (in EUC-KR) | |
278 | perltw Perl for Traditional Chinese (in Big5) | |
279 | ||
fd7b6849 MJD |
280 | =head2 Platform-Specific |
281 | ||
37d4d706 | 282 | perlaix Perl notes for AIX |
a83b6f46 | 283 | perlamiga Perl notes for AmigaOS |
6001596e | 284 | perlandroid Perl notes for Android |
dc5c060f | 285 | perlbs2000 Perl notes for POSIX-BC BS2000 |
49877630 | 286 | perlcygwin Perl notes for Cygwin |
41630250 | 287 | perlfreebsd Perl notes for FreeBSD |
f6706af3 | 288 | perlhaiku Perl notes for Haiku |
49877630 | 289 | perlhpux Perl notes for HP-UX |
a83b6f46 | 290 | perlhurd Perl notes for Hurd |
469e7be4 | 291 | perlirix Perl notes for Irix |
991e8403 | 292 | perllinux Perl notes for Linux |
0d53b15f | 293 | perlmacosx Perl notes for Mac OS X |
b0846812 | 294 | perlopenbsd Perl notes for OpenBSD |
49877630 GS |
295 | perlos2 Perl notes for OS/2 |
296 | perlos390 Perl notes for OS/390 | |
522b859a | 297 | perlos400 Perl notes for OS/400 |
a83b6f46 JH |
298 | perlplan9 Perl notes for Plan 9 |
299 | perlqnx Perl notes for QNX | |
2f08ed66 | 300 | perlriscos Perl notes for RISC OS |
d420ca49 | 301 | perlsolaris Perl notes for Solaris |
58534900 | 302 | perlsynology Perl notes for Synology |
772ff3b9 | 303 | perltru64 Perl notes for Tru64 |
49877630 | 304 | perlvms Perl notes for VMS |
9a997319 | 305 | perlvos Perl notes for Stratus VOS |
49877630 GS |
306 | perlwin32 Perl notes for Windows |
307 | ||
0aef0fe5 NC |
308 | =for buildtoc flag -r |
309 | ||
e653ab25 DR |
310 | =head2 Stubs for Deleted Documents |
311 | ||
312 | perlboot | |
313 | perlbot | |
9ab63835 | 314 | perlrepository |
5d0b49e8 | 315 | perltodo |
e653ab25 DR |
316 | perltooc |
317 | perltoot | |
318 | ||
0aef0fe5 | 319 | =for buildtoc __END__ |
35dec5db | 320 | |
6b43eec4 DG |
321 | On a Unix-like system, these documentation files will usually also be |
322 | available as manpages for use with the F<man> program. | |
a0d0e21e | 323 | |
f747cd2a MB |
324 | Some documentation is not available as man pages, so if a |
325 | cross-reference is not found by man, try it with L<perldoc>. Perldoc can | |
326 | also take you directly to documentation for functions (with the B<-f> | |
327 | switch). See C<perldoc --help> (or C<perldoc perldoc> or C<man perldoc>) | |
328 | for other helpful options L<perldoc> has to offer. | |
329 | ||
6b43eec4 | 330 | In general, if something strange has gone wrong with your program and you're |
71b5b092 SF |
331 | not sure where you should look for help, try making your code comply with |
332 | B<use strict> and B<use warnings>. These will often point out exactly | |
333 | where the trouble is. | |
a0d0e21e LW |
334 | |
335 | =head1 DESCRIPTION | |
336 | ||
d27f2b2f DG |
337 | Perl officially stands for Practical Extraction and Report Language, |
338 | except when it doesn't. | |
339 | ||
72033c14 | 340 | Perl was originally a language optimized for scanning arbitrary |
a0d0e21e | 341 | text files, extracting information from those text files, and printing |
72033c14 JV |
342 | reports based on that information. It quickly became a good language |
343 | for many system management tasks. Over the years, Perl has grown into | |
b6538e4f | 344 | a general-purpose programming language. It's widely used for everything |
72033c14 JV |
345 | from quick "one-liners" to full-scale application development. |
346 | ||
347 | The language is intended to be practical (easy to use, efficient, | |
c1264fa8 RS |
348 | complete) rather than beautiful (tiny, elegant, minimal). It combines |
349 | (in the author's opinion, anyway) some of the best features of B<sed>, | |
0e7bd06d | 350 | B<awk>, and B<sh>, making it familiar and easy to use for Unix users to |
c1264fa8 RS |
351 | whip up quick solutions to annoying problems. Its general-purpose |
352 | programming facilities support procedural, functional, and | |
353 | object-oriented programming paradigms, making Perl a comfortable | |
354 | language for the long haul on major projects, whatever your bent. | |
355 | ||
356 | Perl's roots in text processing haven't been forgotten over the years. | |
357 | It still boasts some of the most powerful regular expressions to be | |
358 | found anywhere, and its support for Unicode text is world-class. It | |
359 | handles all kinds of structured text, too, through an extensive | |
360 | collection of extensions. Those libraries, collected in the CPAN, | |
361 | provide ready-made solutions to an astounding array of problems. When | |
362 | they haven't set the standard themselves, they steal from the best | |
363 | -- just like Perl itself. | |
a0d0e21e | 364 | |
8e465e4e JH |
365 | =head1 AVAILABILITY |
366 | ||
14218588 | 367 | Perl is available for most operating systems, including virtually |
055fd3a9 GS |
368 | all Unix-like platforms. See L<perlport/"Supported Platforms"> |
369 | for a listing. | |
8bc4a6bb | 370 | |
a0d0e21e LW |
371 | =head1 ENVIRONMENT |
372 | ||
028611fa | 373 | See L<perlrun/ENVIRONMENT>. |
a0d0e21e LW |
374 | |
375 | =head1 AUTHOR | |
376 | ||
19799a22 | 377 | Larry Wall <larry@wall.org>, with the help of oodles of other folks. |
a0d0e21e | 378 | |
a99b1639 TP |
379 | If your Perl success stories and testimonials may be of help to others |
380 | who wish to advocate the use of Perl in their applications, | |
381 | or if you wish to simply express your gratitude to Larry and the | |
19799a22 | 382 | Perl developers, please write to perl-thanks@perl.org . |
a99b1639 | 383 | |
a0d0e21e LW |
384 | =head1 FILES |
385 | ||
5f05dabc | 386 | "@INC" locations of perl libraries |
a0d0e21e | 387 | |
5290b67b DH |
388 | "@INC" above is a reference to the built-in variable of the same name; |
389 | see L<perlvar> for more information. | |
390 | ||
a0d0e21e LW |
391 | =head1 SEE ALSO |
392 | ||
e6fbcce1 KL |
393 | https://www.perl.org/ the Perl homepage |
394 | https://www.perl.com/ Perl articles | |
395 | https://www.cpan.org/ the Comprehensive Perl Archive | |
396 | https://www.pm.org/ the Perl Mongers | |
19799a22 | 397 | |
a0d0e21e LW |
398 | =head1 DIAGNOSTICS |
399 | ||
71b5b092 SF |
400 | Using the C<use strict> pragma ensures that all variables are properly |
401 | declared and prevents other misuses of legacy Perl features. | |
1c3cfd87 BC |
402 | These are enabled by default within the scope of |
403 | C<L<use v5.12|perlfunc/use VERSION>> (or higher). | |
71b5b092 | 404 | |
1c3cfd87 BC |
405 | The C<use warnings> pragma produces some lovely diagnostics. |
406 | It is enabled by default when you say C<use v5.35> (or higher). | |
407 | One can also use the B<-w> flag, but its use is normally discouraged, | |
408 | because it gets applied to all executed Perl code, including that not under | |
6753a9e9 | 409 | your control. |
a0d0e21e | 410 | |
5a964f20 TC |
411 | See L<perldiag> for explanations of all Perl's diagnostics. The C<use |
412 | diagnostics> pragma automatically turns Perl's normally terse warnings | |
413 | and errors into these longer forms. | |
a0d0e21e LW |
414 | |
415 | Compilation errors will tell you the line number of the error, with an | |
416 | indication of the next token or token type that was to be examined. | |
14218588 | 417 | (In a script passed to Perl via B<-e> switches, each |
a0d0e21e LW |
418 | B<-e> is counted as one line.) |
419 | ||
420 | Setuid scripts have additional constraints that can produce error | |
421 | messages such as "Insecure dependency". See L<perlsec>. | |
422 | ||
71b5b092 SF |
423 | Did we mention that you should definitely consider using the B<use warnings> |
424 | pragma? | |
a0d0e21e LW |
425 | |
426 | =head1 BUGS | |
427 | ||
71b5b092 | 428 | The behavior implied by the B<use warnings> pragma is not mandatory. |
a0d0e21e LW |
429 | |
430 | Perl is at the mercy of your machine's definitions of various | |
1b3f7d21 CS |
431 | operations such as type casting, atof(), and floating-point |
432 | output with sprintf(). | |
a0d0e21e | 433 | |
748a9306 | 434 | If your stdio requires a seek or eof between reads and writes on a |
a0d0e21e LW |
435 | particular stream, so does Perl. (This doesn't apply to sysread() |
436 | and syswrite().) | |
437 | ||
438 | While none of the built-in data types have any arbitrary size limits | |
439 | (apart from memory size), there are still a few arbitrary limits: a | |
a30ac152 GS |
440 | given variable name may not be longer than 251 characters. Line numbers |
441 | displayed by diagnostics are internally stored as short integers, | |
442 | so they are limited to a maximum of 65535 (higher numbers usually being | |
443 | affected by wraparound). | |
a0d0e21e | 444 | |
8166b4e0 | 445 | You may submit your bug reports (be sure to include full configuration |
19799a22 | 446 | information as output by the myconfig program in the perl source |
8166b4e0 | 447 | tree, or by C<perl -V>) to L<https://github.com/Perl/perl5/issues>. |
4633a7c4 | 448 | |
a0d0e21e LW |
449 | Perl actually stands for Pathologically Eclectic Rubbish Lister, but |
450 | don't tell anyone I said that. | |
451 | ||
452 | =head1 NOTES | |
453 | ||
454 | The Perl motto is "There's more than one way to do it." Divining | |
455 | how many more is left as an exercise to the reader. | |
456 | ||
4633a7c4 | 457 | The three principal virtues of a programmer are Laziness, |
a0d0e21e | 458 | Impatience, and Hubris. See the Camel Book for why. |
16d20bd9 | 459 |