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本帖最后由 jason680 于 2014-09-03 11:18 编辑
回复 10# Kasiotao
Supported if you have the GNU awk 4.0
http://www.gnu.org/software/gawk/manual/gawk.html#Feature-History
...
Version 4.0 of gawk introduced the following features:
Variable additions:
- FPAT, which allows you to specify a regexp that matches the fields, instead of matching the field separator (see Splitting By Content).
- If PROCINFO["sorted_in"] exists, ‘for(iggy in foo)’ loops sort the indices before looping over them. The value of this element provides control over how the indices are sorted before the loop traversal starts (see Controlling Scanning).
- PROCINFO["strftime"], which holds the default format for strftime() (see Time Functions).
The special files /dev/pid, /dev/ppid, /dev/pgrpid and /dev/user were removed.
Support for IPv6 was added via the /inet6 special file. /inet4 forces IPv4 and /inet chooses the system default, which is probably IPv4 (see TCP/IP Networking).
The use of ‘\s’ and ‘\S’ escape sequences in regular expressions (see GNU Regexp Operators).
Interval expressions became part of default regular expressions (see Regexp Operators).
POSIX character classes work even with --traditional (see Regexp Operators).
break and continue became invalid outside a loop, even with --traditional (see Break Statement, and also see Continue Statement).
fflush(), nextfile, and ‘delete array’ are allowed if --posix or --traditional, since they are all now part of POSIX.
An optional third argument to asort() and asorti(), specifying how to sort (see String Functions).
The behavior of fflush() changed to match Brian Kernighan’s awk and for POSIX; now both ‘fflush()’ and ‘fflush("")’ flush all open output redirections (see I/O Functions).
The isarray() function which distinguishes if an item is an array or not, to make it possible to traverse multidimensional arrays (see Type Functions).
The patsplit() function which gives the same capability as FPAT, for splitting (see String Functions).
An optional fourth argument to the split() function, which is an array to hold the values of the separators (see String Functions).
Arrays of arrays (see Arrays of Arrays).
The BEGINFILE and ENDFILE special patterns (see BEGINFILE/ENDFILE).
Indirect function calls (see Indirect Calls).
switch / case are enabled by default (see Switch Statement).
Command line option changes (see Options):
- The -b and --characters-as-bytes options which prevent gawk from treating input as a multibyte string.
- The redundant --compat, --copyleft, and --usage long options were removed.
- The --gen-po option was finally renamed to the correct --gen-pot.
- The --sandbox option which disables certain features.
- All long options acquired corresponding short options, for use in ‘#!’ scripts.
Directories named on the command line now produce a warning, not a fatal error, unless --posix or --traditional are used (see Command line directories).
The gawk internals were rewritten, bringing the dgawk debugger and possibly improved performance (see Debugger).
Per the GNU Coding Standards, dynamic extensions must now define a global symbol indicating that they are GPL-compatible (see Plugin License).
In POSIX mode, string comparisons use strcoll() / wcscoll() (see POSIX String Comparison).
The option for raw sockets was removed, since it was never implemented (see TCP/IP Networking).
Ranges of the form ‘[d-h]’ are treated as if they were in the C locale, no matter what kind of regexp is being used, and even if --posix (see Ranges and Locales).
Support was removed for the following systems:
- Atari
- Amiga
- BeOS
- Cray
- MIPS RiscOS
- MS-DOS with Microsoft Compiler
- MS-Windows with Microsoft Compiler
- NeXT
- SunOS 3.x, Sun 386 (Road Runner)
- Tandem (non-POSIX)
- Prestandard VAX C compiler for VAX/VMS
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楼主: louis0o0
发表于 2014-09-03 10:53
