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Full Discussion: Copy file and evaluate its internal variables
Top Forums Shell Programming and Scripting Copy file and evaluate its internal variables Post 302763161 by Chubler_XL on Tuesday 29th of January 2013 03:43:42 PM
Old 01-29-2013
You could use awk (nawk or gawk).

This example looks for %%var%% and expands with the value of the shell variable. Note you need to export the variable so awk can see it:

expand.sh:
Code:
awk -F% ' /%%/ {
 while(match($0, "%%[A-Za-z0-9_]+%%")) {
    tmp = substr($0, 1, RSTART-1)
    var = substr($0, RSTART+2, RLENGTH-4);
    printf "%s%s", tmp, ENVIRON[var];
    $0=substr($0,RSTART+RLENGTH);
 }
 print; next } 1' $@

template:
Code:
dbname: %%DBNAME%%
dbusername:  %%DB_USER_NAME%%
dbpwd:  %%DB_PWD%%

Test script:
Code:
DBNAME="testing1"; export DBNAME
DB_USER_NAME="Test user"; export DB_USER_NAME
DB_PWD="/home/testing1"; export DB_PWD
./expand.sh template

Last edited by Chubler_XL; 01-29-2013 at 04:46 PM.. Reason: Formatting
 

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LEARN ABOUT CENTOS

perl::critic::policy::builtinfunctions::prohibitlvaluesubstr

Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSuUser(Contributed Perl DocumPerl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3)

NAME

       Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr - Use 4-argument "substr" instead of writing "substr($foo, 2, 6) = $bar".

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Conway discourages the use of "substr()" as an lvalue, instead recommending that the 4-argument version of "substr()" be used instead.

	   substr($something, 1, 2) = $newvalue;     # not ok
	   substr($something, 1, 2, $newvalue);      # ok

       The four-argument form of "substr()" was introduced in Perl 5.005.  This policy does not report violations on code which explicitly
       specifies an earlier version of Perl (e.g. "use 5.004;").

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       "substr" in perlfunc (or "perldoc -f substr").

       "4th argument to substr" in perl5005delta

AUTHOR

       Graham TerMarsch <graham@howlingfrog.com>

COPYRIGHT

       Copyright (c) 2005-2011 Graham TerMarsch.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2014-06-09	   Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3)
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