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Quick links About
perl
Syntax
Examples
Where
to obtain Perl
Related commands
Linux / Unix main page
About perl
Perl is a programming language optimized for scanning arbitrary text files, extracting information from those text files, and
printing reports based on that information. It's also a good language for many system management tasks. The language is intended to be practical (easy to use, efficient, complete) rather than beautiful (tiny, elegant,
minimal).
Syntax
perl [-s] [-T] [-u] [-U] [-h] [-v] [-V[:configvar] ] [-c]
[-w] [-d[:debugger] ] [ -D[number/list] ] [-p] [-n] [-a] [ -F
pattern ] [ -l[octal] ] [-0[octal] ] [ -Idir ] [ -m[-]module ] [ -M[-]'module...' ]
-P] [-S] [-x[dir] ] [ -i[extension] ] -e 'command'] [ -- ] [programfile] [argument]
| -s |
Enables rudimentary option parsing
for options on the command line after the script name but before
any file name arguments (or before a --). |
| -T |
Forces "taint" checks to
be turned on so you can test them. |
| -u |
|
| -U |
Allows perl to do unsafe operations. |
| -h |
|
| -v |
Prints the version and patch level
configuration of your perl executable. |
| -V[:conigvar] |
Prints summary of the major perl
configuration values and the current value of @INC. |
| -c |
Checks the syntax of the script and
then exits without executing it. |
| -w |
Prints warnings about variable names
that are mentioned only once, and scalar variables that are used
before being set. |
| -d |
Runs the script under the perl
debugger |
| -D |
Sets debugging flags. To turn on debugging
flags, you can either specify a number which is the total
of the numeric values of the desired flags (for example, -D14
turns on the Trace Execution, Label Stack Processing, and Stack
Snapshots flags) or a list of the letters associated with
those flags (for example, -Dtls is
the same as -D14). Another nice
value is -Dx, which lists your
compiled syntax tree. And -Dr
displays compiled regular expressions. The available flags are:
| 1 |
p |
Tokenizing and parsing |
| 2 |
s |
Stack snapshots |
| 4 |
l |
Lable stack processing |
| 8 |
t |
Trace execution |
| 16 |
o |
Operator node construction |
| 32 |
c |
String/numeric conversions |
| 64 |
p |
Print processor command for -P |
| 128 |
m |
Memory allocation |
| 256 |
f |
Format processing |
| 512 |
r |
Regular expression parsing |
| 1024 |
x |
Syntax tree dump |
| 2048 |
u |
Tainting checks |
| 4096 |
L |
Memory leaks (not supported with later versions) |
| 8192 |
H |
Hash dump -- usurps values () |
| 16384 |
X |
Scratchpad allocation |
| 32768 |
D |
Cleaning up |
|
| -p |
assumes the following loop around
your script.
while (<>) {
# your script goes here
} continue {
print or die "-p destination: $!\n";
}
|
| -n |
Assumes the following loop around
your script.
while (<>) {
# your script goes here
}
|
| -a |
Turns on autosplit mode when used
with a -n or -p. |
| -F pattern |
Specifies a pattern expression to
split on |
| -l octal |
Enables automatic line-ending
processing. |
| -0 octal |
Specifies the input record separator
($/) as an octal number. If there are no digits, the
null character is the separator. Other options may precede or
follow the digits. |
| -I dir |
Prepends directory to the
search path for modules (@INC) |
| -m module |
Executes use module ();
before executing the script. |
| -M 'module' |
executes use module ;
before executing the script. |
| -P |
Runs your script through the
preprocessor script cppstdin before compilation by perl. |
| -S |
Uses the PATH environment variable
to search for the script (unless the name of the script starts
with a slash). |
| -x dir |
Tells perl that the script is
embedded in a message. |
| -i extension |
specifies that files processed by
the <> construct are to be edited in-place. |
| -e command |
Specifies a line of script. |
| -- |
|
| programfile |
Name of the perl program |
| agument |
|
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Examples
perl myscript.cgi -d - Would run a debug though
the CGI / Perl Script myscript.cgi and if any errors are reported stop
and report them else wise run through the complete script.
Where to obtain perl
Perl is available in a wide range of operating systems, below is a
listing of operating systems which currently support Perl or have
planned versions of Perl being released for them. Versions, additional
information and downloads can be found at: http://www.perl.com/CPAN/ports/index.html
| AIX |
Linux |
SCO ODT/OSR |
A/UX |
MachTen |
| Solaris |
BeOS |
MPE/iX |
SunOS |
BSD/OS |
| NetBSD |
SVR4 |
DG/UX |
NextSTEP |
Tru64 |
| DomainOS |
OpenBSD |
Ultrix |
DOS DJGPP |
OpenSTEP |
| UNICOS |
DYNIX/ptx |
OS/2 |
VMS |
FreeBSD |
| OS390 |
VOS |
HP-UX |
PowerMAX |
Windows 3.1 |
| Hurd |
QNX |
Windows 95 |
Windows 98 |
Windows NT |
| 3b1 |
FPS |
Plan 9 |
AmigaOS |
GENIX |
| PowerUX |
ConvexOS |
Greenhills |
RISC/os |
CX/UX |
| ISC |
Stellar |
DC/OSx |
MachTen 68k |
SVR2 |
| DDE SMES |
MiNT |
TI1500 |
DOS EMX |
MPC |
| TitanOS |
Dynix |
NEWS-OS |
UNICOS/mk |
EP/IX |
| Opus |
Unisys Dynix |
Esix |
Unixware |
BS2000 |
| Netware |
Rhapsody |
VM/ESA |
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Related commands
a2p
s2p
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| Resolved |
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