05-13-2008
How to parse a string efficiently
I am new to the boards and to shell programming and have a requirement to name new files received with a unique sequence number. I need to look at a particular file pattern that exists and then to increment a sequence by 1 and write the new file.
Example of file names and sequence #
part1_part2_part3_datesequence.dat
or
part1_part2_part3_part4_datesequence.dat
the sequence is a 6 digit right justified 0 filled number attached to the date - 20080501000001.dat, but may be the 4th, 5th, 6th or 7th token of the filename.
I have a script that creates the new files, but I am having trouble with how to efficiently extract the sequence number in order to increment it by 1 for a given file pattern and date and then write the new file.
Any help would be appreciated and I am trying to stay with shell or sed or awk as I do not have access to perl.
thanks!
Mike
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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)