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 | |
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 | | |
Related commands a2p
s2p | |
| Resolved |
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