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Top Forums UNIX for Dummies Questions & Answers Unexpected command/filename substitution ( caused by alias?) Post 302773357 by phil518 on Wednesday 27th of February 2013 06:44:21 PM
Old 02-27-2013
Unexpected command/filename substitution ( caused by alias?)

Hi:

there is a shell script, with the name "foo", located in a bin directory. in the same time, there is an alias "foo='/path/bin/foo' ", just for convenience.

in my home directory, there is a different script with name "foo" too. (a modified version.)

while in my home directory, when I do:

>$ cat foo

my local "foo" is displayed, as expected.

but if I do:
>$ source foo,

the common "/path/bin/foo" gets picked up, not my local one, as if the alias "foo" kicks in and substitutes the common "foo" for my local one.

to source my local "foo", I have to explicitly say:

>$ source ./foo

what I don't get is, the "foo" is the filename argument for both "cat" and "source" commands, but why the "foo" alias seemingly kicks in in "source" command, not the "cat" command.

Could any one shed some light on this?

Thanks.

NB Phil
 

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Perl::Critic::Policy::Variables::ProhibitAugmentedAssignUserIContributPerl::Critic::Policy::Variables::ProhibitAugmentedAssignmentInDeclaration(3)

NAME
Perl::Critic::Policy::Variables::ProhibitAugmentedAssignmentInDeclaration - Do not write " my $foo .= 'bar'; ". AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Variable declarations that also do initialization with '=' are common. Perl also allows you to use operators like '.=', '+=', etc., but it it is more clear to not do so. my $foo .= 'bar'; # same as my $foo = 'bar'; our $foo *= 2; # same as our $foo = 0; my ( $foo, $bar ) += ( 1, 2 ); # same as my ( $foo, $bar ) = ( undef, 2 ); local $Carp::CarpLevel += 1; # same as local $Carp::CarpLevel = 1; state $foo += 2; # adds 2 every time it's encountered Such constructs are usually the result of botched cut-and-paste, and often are bugs. Some produce warnings. CONFIGURATION
This Policy is not configurable except for the standard options. AUTHOR
Mike O'Regan COPYRIGHT
Copyright (c) 2011 Mike O'Regan. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module. perl v5.16.3 20Perl::Critic::Policy::Variables::ProhibitAugmentedAssignmentInDeclaration(3)
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