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Full Discussion: Testing the last character in a string
Top Forums Shell Programming and Scripting Testing the last character in a string Post 53179 by jim mcnamara on Wednesday 7th of July 2004 11:37:39 AM
Old 07-07-2004
ksh has some really arcane substitution syntax. It's kinda fun but a lot of programmers don't know it, just like folks use only 20% of vi's capability.

Because folks here do not know all of that stuff, I try to use 'understandable' versions. Here is the same thing using expr, which is also portable to other shells.

Code:
lchr=`expr substr $a ${#a} 1`

the substr operand for expr takes:

$a - string to work on

${#a} - a starting point in the string - in this case the
last character ${#a} is the length of a string.

1 - number of characters after the starting point to return

Generally, if you need a lot of string and array features, try bash.
ksh has most of them but some of it is completely counterintuitive. IMO.
 

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LEARN ABOUT OSX

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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