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Top Forums Shell Programming and Scripting How to pre-check scrutinize all my shell scripts? Post 302983568 by bakunin on Thursday 13th of October 2016 06:14:37 AM
Old 10-13-2016
Quote:
Originally Posted by mohtashims
I am not looking for a fix i.e the corrected commands and their locations. No !!
OK, now i am a bit baffled. In my experience the best error handling is the one where you dn't have to handle anything at all because you avoid the error altogether. Only the next best is to report the error properly.

Quote:
Originally Posted by mohtashims
I m looking only to report the failing commands that fail due to the "command not found" or due to "illegal arguments".
This is quite easy: any responsible script programming includes checking the return codes of all the commands (at least the vital ones). This return code will be non-zero for:

a) - failing commands, regardless of why they fail, but there will be different error codes for the error condition
a1) - unknown argument/option
a2) - not enough rights
a3) - whatever else the error might be

b) - unknown commands

In case of b) the shell itself will return error 127, as you can easily test with a known and an unknown command:

Code:
# ls
[... some output...]
# echo $?
0
# /foo/bar/baz
/bin/ksh: /foo/bar/baz:  not found
# echo $?
127

You should be able to build an error handling function around that.

I hope this helps.

bakunin
 

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Mojo::JSON::Pointer(3pm)				User Contributed Perl Documentation				  Mojo::JSON::Pointer(3pm)

NAME
Mojo::JSON::Pointer - JSON Pointers SYNOPSIS
use Mojo::JSON::Pointer; my $p = Mojo::JSON::Pointer->new; say $p->get({foo => [23, 'bar']}, '/foo/1'); say 'Contains "/foo".' if $p->contains({foo => [23, 'bar']}, '/foo'); DESCRIPTION
Mojo::JSON::Pointer implements JSON Pointers as described in http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer <http://tools.ietf.org/html/draft-ietf-appsawg-json-pointer>. METHODS
"contains" my $success = $p->contains($data, '/foo/1'); Check if data structure contains a value that can be identified with the given JSON Pointer. # True $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/foo'); $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/baz/2'); # False $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/bar'); $p->contains({foo => 'bar', baz => [4, 5, 6]}, '/baz/9'); "get" my $value = $p->get($data, '/foo/bar'); Extract value identified by the given JSON Pointer. # "bar" $p->get({foo => 'bar', baz => [4, 5, 6]}, '/foo'); # "4" $p->get({foo => 'bar', baz => [4, 5, 6]}, '/baz/0'); # "6" $p->get({foo => 'bar', baz => [4, 5, 6]}, '/baz/2'); SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojo::JSON::Pointer(3pm)
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