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Full Discussion: Problems if the else end if
Top Forums Shell Programming and Scripting Problems if the else end if Post 302916020 by Don Cragun on Friday 5th of September 2014 10:56:54 PM
Old 09-05-2014
Quote:
Originally Posted by junior-helper
If the problem is really only that... try replacing ==with -eq
== is for string comparison, -eq for arithmetic test
When comparing decimal numeric strings for equality, the results from:
Code:
[ "$n1" = "$n2" ]
       and
[ "$n1" -eq "$n2" ]

will always be identical as long as there aren't any "leading" zeros at the start of the string or after an initial minus sign

But when one of the two numbers can be an empty string (as in the example given by the OP), the first test will indicate that the two strings are not equal; but the second test will give you a syntax error in some shells (such as bash) because an empty string is not a numeric value. Other shells (such as ksh) will compare them as if the empty string is zero when using -eq.

Some shells accept == as a synonym for = as a test operator, but correctly writen applications will use =, not == in this form of test.
This User Gave Thanks to Don Cragun For This Post:
junior-helper
 

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LEARN ABOUT SUSE

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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