Script invoked using "sh" is not executing. Urgent help required

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flock

FLOCK(1)							  H. Peter Anvin							  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 -s 200
	 # ... commands executed under lock ...
       ) 200>/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 hold ing 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-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

flock utility							    4 Feb 2006								  FLOCK(1)

Shell Programming and Scripting