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Full Discussion: Resolve variable inside another variable
Top Forums Shell Programming and Scripting Resolve variable inside another variable Post 302683355 by DeCoTwc on Tuesday 7th of August 2012 07:16:08 PM
Old 08-07-2012
I'm not quite sure what the issue you're having is. It seems the solution Bartus posted should work. For funsies though, you could probably do it like this:

Code:
(19:12:02\[root@DeCoBoxOmega)
[~/Desktop]$ tables=( "tb1|tb2" "tb3|tb4") #create an array with pairs of tables

(19:12:10\[root@DeCoBoxOmega)
[~/Desktop]$ echo "${tables[0]%%|*}" #use string manipulation to play around with one
tb1

(19:12:26\[root@DeCoBoxOmega)
[~/Desktop]$ echo "${tables[1]##*|}" #Or the other
tb4

(19:12:34\[root@DeCoBoxOmega)
[~/Desktop]$ query="${tables[0]%%|*} Join ${tables[1]##*|}" #Use these arrays to create a variable

(19:12:46\[root@DeCoBoxOmega)
[~/Desktop]$ echo ${query} #and bob's your uncle
tb1 Join tb4

(19:12:50\[root@DeCoBoxOmega)
[~/Desktop]$

This User Gave Thanks to DeCoTwc For This Post:
vinay4889
 

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LEARN ABOUT DEBIAN

freebsd-yyfix

YYFIX(1)						    BSD General Commands Manual 						  YYFIX(1)

NAME

     yyfix -- extract tables from y.tab.c

SYNOPSIS

     yyfix file [tables]

DESCRIPTION

     Programs have historically used a script (often named ``:yyfix'') to extract tables from the yacc(1) generated file y.tab.c.  As the names of
     the tables generated by the current version of yacc(1) are different from those of historical versions of yacc(1), the shell script yyfix is
     provided to simplify the transition.

     The first (and required) argument to yyfix is the name of the file where the extracted tables should be stored.

     If further command line arguments are specified, they are taken as the list of tables to be extracted.  Otherwise, yyfix attempts to deter-
     mine if the y.tab.c file is from an old or new yacc(1), and extracts the appropriate tables.

     The tables ``yyexca'', ``yyact'', ``yypact'', ``yypgo'', ``yyr1'', ``yyr2'', ``yychk'', and ``yydef'' are extracted from historical versions
     of yacc(1).

     The tables ``yylhs'', ``yylen'', ``yydefred'', ``yydgoto'', ``yysindex'', ``yyrindex'', ``yygindex'', ``yytable'', ``yyname'', ``yyrule'',
     and ``yycheck'', are extracted from the current version of yacc(1).

FILES

     y.tab.c  File from which tables are extracted.

SEE ALSO

     yacc(1)

HISTORY

     The yyfix command first appeared in 4.4BSD.

BSD
								  March 23, 1993							       BSD
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