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Full Discussion: Differences in printed commands after execution with same code
Top Forums Shell Programming and Scripting Differences in printed commands after execution with same code Post 302573858 by mjf on Tuesday 15th of November 2011 10:17:16 PM
Old 11-15-2011
Differences in printed commands after execution with same code
I have a korn shell script that executes a function which is stored in a common library. In the function there is obviously some code. Here is the line of code in the function in question:

temp=`echo $status_cnt|tr -d [0-9]`

When the shell script executes with set -x, I'm seeing that on most occasions that the below commands and their arguments are printed as expected based on the above line of code. I'll call this the desired result.

Desired Result
+ + echo 2
+ tr -d [0-9]

However on other, less frequent occasions, I'm seeing the below commands and arguments when the code is executed. I'll call this the undesired result.

Undesired Results
+ + tr -d 2
+ echo 2

Assuming the code in the function is identical on all occasions, what would cause the deviation between the desired and undesired results?

Firstly, why would the 2 commands appear in different order (i.e. shouldn't I always expect the echo to be printed first in the desired result since the echo command precedes the tr -d [0-9] command when being assigned to temp variable)?

Secondly, what would cause the tr -d [0-9] to be printed as tr -d 2?

Thanks in advance!

 

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LEARN ABOUT CENTOS

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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