12-14-2009
thank you for the response but this going to be harder than i thought so this is the details in full:
a software company has established standards with regards to the naming and organisation of files in its linux based filestore. in particular, users are directed to store files of a particular type in the same directory, for example, users sre instructed to store all word processor files in a directory named wp. for the purpose of this exercise therea re 3 types of file available - wordprocessing, spreadsheet and picture files.
up until now house keeping practices have been a bit haphazard and it has been upto the individual user as to the manner in which they organise back up of files, if indeed this is done at all. therefore the company wishes to to develop a new utility which will aid the users in backing up and restoring files in their own personal directory area. in doing this development, it should be recognised that script files are treated like any other i.e. they should be stored in a directory called scriptfiles.
only one utility is to be developed
the utility will give the user the option to back up or restore a set of files
the utility will give the user the ability to specify which type of file is to be used in a particular back up or restore session.
the utility should be robust with respect to files and directories and the possible overwriting of files; the utility should provide help to allow the novice user to make use of the utility.
hopefully someone can understand what is required (because i dont) and hopefully when i do start college it wont be as hard as this for a beginner
cheers
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FLOCK(1) User Commands FLOCK(1)
NAME
flock - manage locks from shell scripts
SYNOPSIS
flock [-sxon] [-w timeout] lockfile [-c] command...
flock [-sxon] [-w timeout] lockdir [-c] command...
flock [-sxun] [-w timeout] fd
DESCRIPTION
This utility manages flock(2) locks from within shell scripts or the command line.
The first and second forms wraps the lock around the executing a command, in a manner similar to su(1) or newgrp(1). It locks a specified
file or directory, which is created (assuming appropriate permissions), if it does not already exist.
The third form is convenient inside shell scripts, and is usually used the following manner:
(
flock -n 9 || exit 1
# ... commands executed under lock ...
) 9>/var/lock/mylockfile
The mode used to open the file doesn't matter to flock; using > or >> allows the lockfile to be created if it does not already exist, how-
ever, write permission is required; using < requires that the file already exists but only read permission is required.
By default, if the lock cannot be immediately acquired, flock waits until the lock is available.
OPTIONS
-s, --shared
Obtain a shared lock, sometimes called a read lock.
-x, -e, --exclusive
Obtain an exclusive lock, sometimes called a write lock. This is the default.
-u, --unlock
Drop a lock. This is usually not required, since a lock is automatically dropped when the file is closed. However, it may be
required in special cases, for example if the enclosed command group may have forked a background process which should not be hold-
ing the lock.
-n, --nb, --nonblock
Fail (with an exit code of 1) rather than wait if the lock cannot be immediately acquired.
-w, --wait, --timeout seconds
Fail (with an exit code of 1) if the lock cannot be acquired within seconds seconds. Decimal fractional values are allowed.
-o, --close
Close the file descriptor on which the lock is held before executing command. This is useful if command spawns a child process
which should not be holding the lock.
-c, --command command
Pass a single command to the shell with -c.
-h, --help
Print a help message.
AUTHOR
Written by H. Peter Anvin <hpa@zytor.com>.
COPYRIGHT
Copyright (C) 2003-2006 H. Peter Anvin.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
flock(2)
AVAILABILITY
The flock command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux February 2006 FLOCK(1)