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1. Shell Programming and Scripting
Hello All,
I have exactly same issue @vikas_trl had in following link:
https://www.unix.com/shell-programming-and-scripting/259854-control-not-returning-sqlplus-calling-unix-shell-script.html
I wonder if he or somebody else could find the issue's cause or the solution.
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2. Shell Programming and Scripting
Hello All,
I have a UNIX script which will prepare anonymous oracle pl/sql block in a temporary file in run time and passes this file to sqlplus as given below.
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BEGIN
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3. Red Hat
Hi,
I am facing a strange issue when connecting to SQLPLUS via a shell scripts.
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4. Shell Programming and Scripting
I have a python script that calls a binary. I want to make sure that if the binary fails (with a 2 min timeout) it kills the process. Currently I'm unable to do that as I only kill the function but the binary is still running. Please help
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5. UNIX for Dummies Questions & Answers
We are facing difficulties in ftp'ing large files.For large file transfer using FTP, the control session gets timed out where as the the data session is active and transfers the file completely. Is there a way to make the control session active as long as data session?
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6. Shell Programming and Scripting
Hi forum,
I have a problem concerning job or process scheduling and control.
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7. UNIX for Dummies Questions & Answers
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I found that in my system , there are some strange process , it will make the system crash so I would like to control the system no such process is running ,
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9. UNIX for Advanced & Expert Users
Hi...
This is message that occurs when i am trying to shutdown the linux system
timeout opening writing control channel /dev/initctl
how can i shutdown what is the problem here..
Thanks in advance
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10. Filesystems, Disks and Memory
can anyone send me enything about "unix process control "
nicko@freemail.com.mk (2 Replies)
Discussion started by: nicko
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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 -n 9
# ... 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/.
flock utility 4 Feb 2006 FLOCK(1)