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Full Discussion: help with sed command
Top Forums Shell Programming and Scripting help with sed command Post 302309760 by oomanamemni on Wednesday 22nd of April 2009 07:53:42 PM
Old 04-22-2009
help with sed command
I'm new to shell programming and am trying to delete/replace certain characters in a pattern. Here's an example of what I'm trying to do.

input file has multiple lines of the following form

#0,v,g,n,n,n,(stuff....)
#1,x,g,n,c,n,(stuff..blah..blah)
#2,x,g,x,x,m,(stuff..blah)
...
#25,x,g,x,x,n,(stuff...)

and I want to output to be

#0,v,g,n,n,(stuff...)
#1,u,g,n,c,(stuff....)
#2,u,g,n,n,(stuff...)
.....
#25,u,g,n,n,(stuff....)

Basically I need to replace the first occurrence of x with u then the rest with n. This part I was able to do. Then I need to remove the last letter from the pattern (n or m) and leave the rest. Is there some way I can search for say ,.,.,.,.,., and then remove the last ., without knowing what character it will be or which occurrence. Say read the pattern into a variable and then remove the last character through its index or something.

Thanks for any help on figure this out

D
 

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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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