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Full Discussion: Capturing time stamp in file name
Top Forums Shell Programming and Scripting Capturing time stamp in file name Post 302964171 by bakunin on Monday 11th of January 2016 04:57:32 PM
Old 01-11-2016
Quote:
Originally Posted by ldorsey
I feel like I should use some sort of regex, but I don't want to force the shell script to look through the entire directory for that file. Is there a way to do this?
In any way the shell will have to look through the directory anyway, because file regexes ("globs" in shell speak) are expanded by the shell - always. If you write a command like ls -l foo* The shell will first expand foo* to a list of files matching this expression, let us say fooA fooB fooC, and then feed this to the ls command. Entering the command ls -l fooA fooB fooC would have had the same effect.

Therefore: either you know exactly what your file is named beforehand or you will have to use a glob (like "*", "?", etc.). On the up side it doesn't take much time to search through a directory at all, because UNIX kernels are in the habit of putting every ounce of spare memory to disk caching. Because metadata (inodes, directories, the supernode and so on) are used very often (compared to the content of most files) chances are the needed data are already in memory and are found pretty quickly.

I hope this helps.

bakunin
 

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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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