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Full Discussion: [bash] wanted: function with a clean way for multiple return values
Top Forums Shell Programming and Scripting [bash] wanted: function with a clean way for multiple return values Post 302977116 by Don Cragun on Tuesday 12th of July 2016 07:35:05 PM
Old 07-12-2016
Without knowing what arguments you intend to pass to _exec and what output you are hoping to produce, we can only make wild guesses about what might or might not work for you.

But using echo to print arbitrary text is dangerous (especially when the operating system you're using and the environment variables in place when your script is invoked are unspecified).

Is there a limited set of commands that will be passed to your _exec function as the 1st operand, or can the user specify any command available on your system? Will your _exec function be invoked with a command and parameters in a quoted string passed as the 1st operand; or just a command name that will be executed with no parameters?

How many terabytes of output might be produced by the command given as the 1st operand to your _exec function?

Where is the variable ESHELLERR assigned a value (or are you expecting _fatal to be called with three operands instead of four)?
 

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LEARN ABOUT CENTOS

pcre_get_substring

PCRE_GET_SUBSTRING(3)					     Library Functions Manual					     PCRE_GET_SUBSTRING(3)

NAME

       PCRE - Perl-compatible regular expressions

SYNOPSIS


       #include <pcre.h>

       int pcre_get_substring(const char *subject, int *ovector,
	    int stringcount, int stringnumber,
	    const char **stringptr);

       int pcre16_get_substring(PCRE_SPTR16 subject, int *ovector,
	    int stringcount, int stringnumber,
	    PCRE_SPTR16 *stringptr);

       int pcre32_get_substring(PCRE_SPTR32 subject, int *ovector,
	    int stringcount, int stringnumber,
	    PCRE_SPTR32 *stringptr);

DESCRIPTION


       This is a convenience function for extracting a captured substring. The arguments are:

	 subject       Subject that has been successfully matched
	 ovector       Offset vector that pcre[16|32]_exec() used
	 stringcount   Value returned by pcre[16|32]_exec()
	 stringnumber  Number of the required substring
	 stringptr     Where to put the string pointer

       The  memory  in	which  the substring is placed is obtained by calling pcre[16|32]_malloc(). The convenience function pcre[16|32]_free_sub-
       string() can be used to free it when it is no longer needed. The yield of the function is the length of the substring,  PCRE_ERROR_NOMEMORY
       if sufficient memory could not be obtained, or PCRE_ERROR_NOSUBSTRING if the string number is invalid.

       There is a complete description of the PCRE native API in the pcreapi page and a description of the POSIX API in the pcreposix page.

PCRE 8.30							   24 June 2012 					     PCRE_GET_SUBSTRING(3)
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