hi guys ..newbie here i would like to create a simple script tat will detect wether the machine has IP or not ...
but it seems that my script doesnt really work it kept rebooting...
i set this script during boot so that it will check else it will reboot
it a shell script thou...
Code:
if [!`hostname -i`] then echo "System rebooting in 3s"; sleep 3; reboot;else echo "Your Current IP is : `hostname -i`"; echo "Starting System in 3s"; sleep 3;
But this end result was my system end up infinite loops of reboots ... hope someone can help me ... thx.
I want to create an automated script which is called by another maually executed script.
The condition is that the no one should be able to manually execute the automated script.
The automated script can be on the same machine or it can be on a remote machine.
Can any one suggest a check in the... (1 Reply)
I have written the below script to determine whether a string is palindrome or not ?
But its not working, any help to debug it ?
I am new to this forum but when I searched for my question, I found that many people refused to answer this question thinking that its Homework question, Therefore I... (2 Replies)
Hi,
I need to check whether one file has EOF or not.
There's one daemon in our system, which will pick the files FTPed to us. However, sometimes the daemon picks the file before FTP is finished.
So I'm planning to add some checking of EOF on the FTPed files in the shell script.
Could... (8 Replies)
could you please find a solution for this
script that checks if any of a list of users given on the command line is logged in. For each user the script should say whether this user is logged in or not. The script prints an error message if no parameter is given. And ask the user to enter a name... (3 Replies)
I have a local linux machine in which the files are dumped by a remote ubuntu server. If the process in remote server has any problem then empty files are created in local machine. Is there any way using perl script to check if the empty files are being created and delete them and then run a shell... (2 Replies)
Hi Scripting Gurus,
Can someone help to transform the below logic into a shell script, might be easy for some of you.
I have a file with below text, I need if the line has the ":" and the above to it is not a blank line should print " <text>: is incorrect format"
Apple:
... (3 Replies)
hi guys
we've had nagios spewing false alarm (for the umpteenth time) and finally the customer had enough so they're starting to question nagios. we had the check interval increased from 5 minutes to 2 minutes, but that's just temporary solution. I'm thinking of implementing a script on the... (8 Replies)
Hi All, I am very new to this forum and Unix too...
I need to create a script which has to check for a file's occurrence in a specified location for 4 hours and send out a email when ever the file has arrived.
It should also have a timer to send the status message for every 15 minutes if the... (2 Replies)
Hi Experts,
I am not good in writing script. Just stared.I am looking for shell script to check following parameters.
1) Number of files on remote Linux SUSE server.- Any directory and sub directory.
2) I should define number of files in script. Files should be variable.
3) Age of... (2 Replies)
I'm required to write a simple shell script that when it runs it writes the output which is a simple barcode to a tmp flat file which I can do the bit I'm struggling with...
The next time it runs I need to check the tmp output file to see if that barcode is in the output file and if it is send... (5 Replies)
Discussion started by: worky
5 Replies
LEARN ABOUT CENTOS
truncate
TRUNCATE(1) User Commands TRUNCATE(1)NAME
truncate - shrink or extend the size of a file to the specified size
SYNOPSIS
truncate OPTION... FILE...
DESCRIPTION
Shrink or extend the size of each FILE to the specified size
A FILE argument that does not exist is created.
If a FILE is larger than the specified size, the extra data is lost. If a FILE is shorter, it is extended and the extended part (hole)
reads as zero bytes.
Mandatory arguments to long options are mandatory for short options too.
-c, --no-create
do not create any files
-o, --io-blocks
treat SIZE as number of IO blocks instead of bytes
-r, --reference=RFILE
base size on RFILE
-s, --size=SIZE
set or adjust the file size by SIZE bytes
--help display this help and exit
--version
output version information and exit
SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ...
(powers of 1000).
SIZE may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round
down to multiple of, '%' round up to multiple of.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report truncate translation bugs to <http://translationpro-
ject.org/team/>
AUTHOR
Written by Padraig Brady.
COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSO dd(1), truncate(2), ftruncate(2)
The full documentation for truncate is maintained as a Texinfo manual. If the info and truncate programs are properly installed at your
site, the command
info coreutils 'truncate invocation'
should give you access to the complete manual.
GNU coreutils 8.22 June 2014 TRUNCATE(1)
02-06-2009
... hope someone can help me ... thx.