I'm new in this shell scripting subject, I´m looking forward for someone to give me a hint or advice as to how to tackle my requirement, which is as follows:
We have a Linux process that runs periodically every day, this process dumps a text file with always the same name overwriting the previous one (information is incrementally added). What I need to accomplish is to rename this file as soon as possible once is generated, following the following nomenclature:
The year, month and day has to be fetched from the first line of the file content, here is an example:
The year, date and month will always be found in a fixed position from this first line (position 17 to 24), which in this example is as follows:
This date is expressed in Month-Day-Year format, and my requirement needs it to be [year][month][day]
Another thing that I need to track is if original file is currently being used, since I dont want to rename the file in the middle of the generation process.
At the end, filename should be:
Kindly requesting your help with my requirement.
Many many thanks in advanced for any help you can provide.
Last edited by Don Cragun; 06-20-2014 at 05:50 PM..
Reason: Change FONT tags to CODE tags.
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LEARN ABOUT CENTOS
git-sh-setup
GIT-SH-SETUP(1) Git Manual GIT-SH-SETUP(1)NAME
git-sh-setup - Common Git shell script setup code
SYNOPSIS
. "$(git --exec-path)/git-sh-setup"
DESCRIPTION
This is not a command the end user would want to run. Ever. This documentation is meant for people who are studying the Porcelain-ish
scripts and/or are writing new ones.
The git sh-setup scriptlet is designed to be sourced (using .) by other shell scripts to set up some variables pointing at the normal Git
directories and a few helper shell functions.
Before sourcing it, your script should set up a few variables; USAGE (and LONG_USAGE, if any) is used to define message given by usage()
shell function. SUBDIRECTORY_OK can be set if the script can run from a subdirectory of the working tree (some commands do not).
The scriptlet sets GIT_DIR and GIT_OBJECT_DIRECTORY shell variables, but does not export them to the environment.
FUNCTIONS
die
exit after emitting the supplied error message to the standard error stream.
usage
die with the usage message.
set_reflog_action
set the message that will be recorded to describe the end-user action in the reflog, when the script updates a ref.
git_editor
runs an editor of user's choice (GIT_EDITOR, core.editor, VISUAL or EDITOR) on a given file, but error out if no editor is specified
and the terminal is dumb.
is_bare_repository
outputs true or false to the standard output stream to indicate if the repository is a bare repository (i.e. without an associated
working tree).
cd_to_toplevel
runs chdir to the toplevel of the working tree.
require_work_tree
checks if the current directory is within the working tree of the repository, and otherwise dies.
require_work_tree_exists
checks if the working tree associated with the repository exists, and otherwise dies. Often done before calling cd_to_toplevel, which
is impossible to do if there is no working tree.
require_clean_work_tree <action> [<hint>]
checks that the working tree and index associated with the repository have no uncommitted changes to tracked files. Otherwise it emits
an error message of the form Cannot <action>: <reason>. <hint>, and dies. Example:
require_clean_work_tree rebase "Please commit or stash them."
get_author_ident_from_commit
outputs code for use with eval to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL and GIT_AUTHOR_DATE variables for a given commit.
create_virtual_base
modifies the first file so only lines in common with the second file remain. If there is insufficient common material, then the first
file is left empty. The result is suitable as a virtual base input for a 3-way merge.
GIT
Part of the git(1) suite
Git 1.8.3.1 06/10/2014 GIT-SH-SETUP(1)