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Top Forums Shell Programming and Scripting awk - Multi-line data to be stored in variable Post 302971477 by Scrutinizer on Wednesday 20th of April 2016 04:00:18 PM
Old 04-20-2016
Interesting. I had a look at this and it appears this behavior is with any character, not just "@", but also for "*", "a" or "b".

I only saw this with AIX and HPUX awk..

A possible explanation for the difference between [@] and @ may be that in the POSIX specification when a single character is used as FS, then this is regarded as a string and not as a regular expression. When [c] is used (where c is a character, for example @) then this is a regular expression.

In these two awks, it appears that, if an RS other than\n is used, and a single character is used as FS then a newline is still seen as a field separator, whereas this is not the case if FS is a regular expression.

I could not find anything in the POSIX specification that describes this behavior, so it is not as it should be. It does remind me a bit of how newlines are field separators irrespective of FS value when RS="" is used, so maybe it is a remnant behavior of some sort.

Last edited by Scrutinizer; 04-20-2016 at 07:29 PM..
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COMPILE_ET(1)						      General Commands Manual						     COMPILE_ET(1)

NAME
compile_et - error table compiler SYNOPSIS
compile_et file DESCRIPTION
Compile_et converts a table listing error-code names and associated messages into a C source file suitable for use with the com_err(3) library. The source file name must end with a suffix of ``.et''; the file consists of a declaration supplying the name (up to four characters long) of the error-code table: error_table name followed by up to 256 entries of the form: error_code name, " string " and a final end to indicate the end of the table. The name of the table is used to construct the name of a subroutine initialize_XXXX_error_table which must be called in order for the com_err library to recognize the error table. The various error codes defined are assigned sequentially increasing numbers (starting with a large number computed as a hash function of the name of the table); thus for compatibility it is suggested that new codes be added only to the end of an existing table, and that no codes be removed from tables. The names defined in the table are placed into a C header file with preprocessor directives defining them as integer constants of up to 32 bits in magnitude. A C source file is also generated which should be compiled and linked with the object files which reference these error codes; it contains the text of the messages and the initialization subroutine. Both C files have names derived from that of the original source file, with the ``.et'' suffix replaced by ``.c'' and ``.h''. A ``#'' in the source file is treated as a comment character, and all remaining text to the end of the source line will be ignored. BUGS
Since the original compile_et uses a very simple parser based on yacc(1), and this current version of compile_et uses an awk/sed combina- tion of scripts, its error recovery leaves much to be desired. SEE ALSO
com_err (3). Ken Raeburn, "A Common Error Description Library for UNIX". SIPB
30 Mar 1998 COMPILE_ET(1)
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