02-07-2010
9 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
what is the function of swap in linux why i have to create apsolutely a particion for the swap when i install (i installed lnx4win mandrake and made an automat. disk particion and the install program one of my disk partitions that was 3gb devidet in 4 one native 700mb swap 600mb and the others i... (1 Reply)
Discussion started by: user666
1 Replies
2. Shell Programming and Scripting
Dears,
Actually i am facing a problem in a UNIX script: I want to convert a column output file to a rows e.g:
from
1234
2345
3456
to
1234 2345 3456
any help please????
Thanks (2 Replies)
Discussion started by: tontal
2 Replies
3. Shell Programming and Scripting
how do i write a script that'll open what i entered and scan it for a certain line of text.
for example, i enter a filename (that exists) and in that file i want to scan a certain word that'll show how much of that word appears throughout the file. (2 Replies)
Discussion started by: mrhenry
2 Replies
4. Shell Programming and Scripting
hello! i am very new to this, so please bear with me. i used red hat linux to creat a little two page website for school, which was really just an exercise in absolute and relative paths.
so, now, its all done, and i want to play with it some more, but i think there may be a problem with vi. i... (3 Replies)
Discussion started by: jojodancer
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5. UNIX for Dummies Questions & Answers
I need to write a script file that will tell me the largest number in a group of numbers. ANy help is greatly appreciated (2 Replies)
Discussion started by: twan
2 Replies
6. UNIX for Dummies Questions & Answers
1. How the Unix system identify the Other User to access for file permission?
2. What command we use to convert the extension of a file name?
3. What command use to convert other editing file to Unix based text file?
Please answer of these Question???Its necessary for me?? (3 Replies)
Discussion started by: pradipta_pks
3 Replies
7. Programming
Hi,
I am doing a C++ self-study and I got stuck with this problem.
I want to have a code that asks the suer to enter two numbers and then it lists the numbers between these two numbers. It has also to print a message if these two numbers are equal.
Here is what I wrote:
#include <iostream>... (11 Replies)
Discussion started by: faizlo
11 Replies
8. Shell Programming and Scripting
Hi,
I'm new to unix and got struck here.Can any one help me out.My question is ..
is the command
if ;
then
echo "do some stuff"
fi
correct?
Thanks in advance
abhijeet (18 Replies)
Discussion started by: Abhijeet_Atti
18 Replies
9. UNIX for Dummies Questions & Answers
Hi,
When doing ls -l, is it right to assume that all files with the date and time on it are files that are created/modified on the current year?
Is there any way to display the creation/modified date of a file that are not created/modified in the current year? (4 Replies)
Discussion started by: newbie_01
4 Replies
LEARN ABOUT FREEBSD
crontab
CRONTAB(1) BSD General Commands Manual CRONTAB(1)
NAME
crontab -- maintain crontab files for individual users (V3)
SYNOPSIS
crontab [-u user] file
crontab [-u user] { -l | -r | -e }
DESCRIPTION
The crontab utility is the program used to install, deinstall or list the tables used to drive the cron(8) daemon in Vixie Cron. Each user
can have their own crontab, and though these are files in /var, they are not intended to be edited directly.
If the allow file exists, then you must be listed therein in order to be allowed to use this command. If the allow file does not exist but
the deny file does exist, then you must not be listed in the deny file in order to use this command. If neither of these files exists, then
depending on site-dependent configuration parameters, only the super user will be allowed to use this command, or all users will be able to
use this command. The format of these files is one username per line, with no leading or trailing whitespace. Lines of other formats will
be ignored, and so can be used for comments.
The first form of this command is used to install a new crontab from some named file or standard input if the pseudo-filename '-' is given.
The following options are available:
-u Specify the name of the user whose crontab is to be tweaked. If this option is not given, crontab examines ``your'' crontab, i.e.,
the crontab of the person executing the command. Note that su(1) can confuse crontab and that if you are running inside of su(1) you
should always use the -u option for safety's sake.
-l Display the current crontab on standard output.
-r Remove the current crontab.
-e Edit the current crontab using the editor specified by the VISUAL or EDITOR environment variables. The specified editor must edit
the file in place; any editor that unlinks the file and recreates it cannot be used. After you exit from the editor, the modified
crontab will be installed automatically.
FILES
/var/cron/allow List of users allowed to use crontab
/var/cron/deny List of users prohibited from using crontab
/var/cron/tabs Directory for personal crontab files
DIAGNOSTICS
A fairly informative usage message appears if you run it with a bad command line.
SEE ALSO
crontab(5), cron(8)
STANDARDS
The crontab command conforms to IEEE Std 1003.2 (``POSIX.2'') with the exception that the dangerous variant of calling crontab without a file
name in the first form of the command is not allowed by this implementation. The pseudo-filename '-' must be specified to read from standard
input. The new command syntax differs from previous versions of Vixie Cron, as well as from the classic SVR3 syntax.
AUTHORS
Paul Vixie <paul@vix.com>
BSD
May 13, 2010 BSD