Count script wrapper help Post: 302312462

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Top Forums Shell Programming and Scripting Count script wrapper help Post 302312462 by durden_tyler on Friday 1st of May 2009 12:35:11 PM

05-01-2009

Registered User

Quote:

Originally Posted by richsark

HI

You think thats the issue?

Yes, check this:

Code:

$
$ # the following command executes successfully
$
$ ls -1 *.jpg
file1.jpg
file2.jpg
$
$ # now when I use back-ticks to run the command,
$ # @x gets assigned the output, or "stdout" of this command
$
$ perl -e '{ @x = `ls -1 *.jpg`; }'
$
$ # it didn't print anything because I did not add the "print"
$ # command explicitly; if I do, then:
$
$ perl -e '{ @x = `ls -1 *.jpg`; print @x; }'
file1.jpg
file2.jpg
$
$ # it prints properly
$
$ # Now this command does not execute successfully
$
$ ls -1 *.bmp
ls: cannot access *.bmp: No such file or directory
$
$ # The message that you see is standard error, or "stderr"
$ # It does not get assigned to @x, as you can see below
$
$ perl -e '{ @x = `ls -1 *.bmp`; }'
ls: cannot access *.bmp: No such file or directory
$
$ # I did not add the "print" command explicitly, still I see
$ # the output - that's because it is the "stderr" thrown by
$ # the command itself. It never got assigned to @x, as the
$ # following one-liner shows.
$
$ perl -e '{ @x = `ls -1 *.bmp`; print "Value of @x => ",@x; }'
ls: cannot access *.bmp: No such file or directory
Value of  => $
$
$

So, essentially you'll have to capture the standard output (stdout) as well as the standard error (stderr) in your perl program. The "back-tick" method can capture stdout, but cannot capture stderr. That's why you'd need those additional modules mentioned in the link above.

Once you've captured both, you'd check stdout for success and stderr for failure, and proceed from there.

HTH,
tyler_durden

durden_tyler

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git-sh-i18n

GIT-SH-I18N(1)							    Git Manual							    GIT-SH-I18N(1)

NAME

       git-sh-i18n - Git's i18n setup code for shell scripts

SYNOPSIS

       . "$(git --exec-path)/git-sh-i18n"

DESCRIPTION

       This is not a command the end user would want to run. Ever. This documentation is meant for people who are studying the Porcelain-ish
       scripts and/or are writing new ones.

       The 'git sh-i18n scriptlet is designed to be sourced (using .) by Git's porcelain programs implemented in shell script. It provides
       wrappers for the GNU gettext and eval_gettext functions accessible through the gettext.sh script, and provides pass-through fallbacks on
       systems without GNU gettext.

FUNCTIONS

       gettext
	   Currently a dummy fall-through function implemented as a wrapper around printf(1). Will be replaced by a real gettext implementation in
	   a later version.

       eval_gettext
	   Currently a dummy fall-through function implemented as a wrapper around printf(1) with variables expanded by the git-sh-
	   i18n--envsubst(1) helper. Will be replaced by a real gettext implementation in a later version.

GIT

       Part of the git(1) suite

Git 1.8.3.1							    06/10/2014							    GIT-SH-I18N(1)