I am writing a script that periodically reads in data from a text file. The only issue is that, that text file is periodically updated (appended to) by another script. I am using perl in UNIX environment. How can I check if that text file is being accessed, so I can wait until it is no longer being... (6 Replies)
We have a third party tool in UNIX to kick off a 'file copy' job based on a file existance. If a specific file exists in an UNIX directory, another process should start copy the file into another system for further processing. The issue is, the copy job is starting as soon as the file exists in... (6 Replies)
Hi Everyone,
Can someone please show me how to create a script that will search a text file for changes.
For example below is a sample of how the text file would look like,
RLH rlh-1 ALIVE 20:06:05
RLH rlh-7 ALIVE 20:06:05
RLH rlh-3 ALIVE ... (7 Replies)
Hello,
I want to make a script which says if a text file is empty or not.
I tried two ways of making it, but I have problems with both of them.
Now I think that the better way is the ls -s solution (considering that an empty text file has a 0 weight, because "cat file.txt" fails when file is... (4 Replies)
HI all,
I want to script where all the server names will be in a text file like
server1
server2
server3 . and the script should take servernames from a text file and perform copy of files if the files are not present on those servers.after which it should take next servername till the end of... (0 Replies)
Hi,
I am writing an SH script where I need to open text editor from within the script and wait until the user closed or quit text editor. And then execute consecutive commands.
Here is a very simplified example:
gedit data.txt
# ---- wait until Text editor is exited
echo "Text Editor is... (1 Reply)
Hi All,
I am very new to this forum and beginner to shell scripting.
I need a shell script to:
Search for a text in XML file à if the same text appears twice in an XML file à output file name
Script should loop thru every xml file of a given folder.
Please help me writing this script.
... (1 Reply)
Guys,
I know that the below command will cut the 13th field from test.txt file
awk -F"|" '{print $13}' test.txt
The answer would be,
CA
CN
Ohio
If we see the 3 rd one, it has more than 2 characters. So i wanted to check this in if condition and i want to get the output if the 13th... (4 Replies)
Is it possible to replace a line of text within a file while it's closed with a single command or a script? Please show me an example or point me to a webpage that shows an example. The file has this line of text:
LoginGraceTime 100
I want to replace it with the following:
... (2 Replies)
Hi all,
Please somebody help me with this:
I want to check if the files listed in a text file, are found under a directory or not.
For example: the file is list_of_files.txt, which contains inside this rows:
# cat list_of_files
logs
errors
paths
debug
#
I want to check if these... (3 Replies)
Discussion started by: arrals_vl
3 Replies
LEARN ABOUT NETBSD
daemon
DAEMON(3) BSD Library Functions Manual DAEMON(3)NAME
daemon -- run in the background
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
int
daemon(int nochdir, int noclose);
DESCRIPTION
The daemon() function is for programs wishing to detach themselves from the controlling terminal and run in the background as system daemons.
Unless the argument nochdir is non-zero, daemon() changes the current working directory to the root (/).
Unless the argument noclose is non-zero, daemon() will redirect standard input, standard output and standard error to /dev/null.
RETURN VALUES
On return 0 indicates success with -1 indicating error.
ERRORS
The function daemon() may fail and set errno for any of the errors specified for the library functions fork(2) and setsid(2).
SEE ALSO fork(2), setsid(2)HISTORY
The daemon() function first appeared in 4.4BSD.
CAVEATS
Unless the noclose argument is non-zero, daemon() will close the first three file descriptors and redirect them to /dev/null. Normally,
these correspond to standard input, standard output and standard error. However, if any of those file descriptors refer to something else
they will still be closed, resulting in incorrect behavior of the calling program. This can happen if any of standard input, standard output
or standard error have been closed before the program was run. Programs using daemon() should therefore make sure to either call daemon()
before opening any files or sockets or, alternately, verifying that any file descriptors obtained have a value greater than 2.
BUGS
daemon() uses fork() as part of its tty detachment mechanism. Consequently the process id changes when daemon() is invoked. Processes
employing daemon() can not be reliably waited upon until daemon() has been invoked.
BSD September 3, 1999 BSD