These lines will check the file daily at noon, on days between the 5th and the 7th when put in your crontab(edit it via crontab -e):
Code:
# Do something if /path/to/file exists
0 12 5,6,7 * * [ -f /path/to/file ] && do_something
# Do something if /path/to/file does not exist
0 12 5,6,7 * * [ -f /path/to/file ] || do_something_else
In general, cron lines work like
Code:
field allowed values
----- --------------
minute 0-59
hour 0-23
day of month 1-31
month 0-12
day of week 0-7 (0 or 7 is Sun)
...and the last field is the shell script(bourne shell, not csh) to be run.
See man 5 crontab for details on the crontab file.
Thanks for your quick replay,
Unfortunately, My sys admin does not want to use cron job to do this, I have to using script to check this. do you have any idea about using script to check it?
Hi,
I have a really, what I hope is, simple question.
I'm looking for a simple way to see whether a file exists or not and then perform an action based on whether it exists or not. An example of what I tried is as follows:
if
then {
echo "File mysql exists"
... (1 Reply)
This isn't a question--its a solution! Below is a script that I wrote for my own script file development which does what the title says. Its the closest that you can get to compiling what are otherwise purely interpreted script files. I offer it here simply for the benefit of anyone else writing... (12 Replies)
Hi, Need help for a Script for checking and reporting database file sizes in a directory.
Request you to please give your valuable inputs.
Thanks a lot in advance.
Best Regards,
Marconi (1 Reply)
Hi,
I'm trying to check a filesize within a script and then excute a relevant action. An example is below:
if
then rm $filename
rm $filename2
elif
then rm $filename2
fi
Basically if $filename2 has a filesize of 0 then I want both files to be removed, but... (6 Replies)
Hello,
I had written a shell script that accepts input file as cmd line argument and process this file.
if ; then
if ; then
. $1
LOGFILE="$LOG_FILE/MIG_BIOS.log";
get_input_file
else
ERROR_CODE=MSCRM0005_003
error "$ERROR_CODE : Input file $1 is not available";
exit... (3 Replies)
All,
Is there a way to keep checking for a file over and over again in the same script for an interval of time?
Ie
If {
mail -user
continue checking until file arrives
file arrives
tasks
exit
I don't want the script to run each time and email the user each time a file... (4 Replies)
I am trying to write a script that checks whether or not, a file exists on multiple servers.
My code / logic so far is:
#!/usr/bin/ksh
print "Enter File name to be checked"
read MYFILE
ssh server1 "
cd /var/opt/logs ;
if
then
... (4 Replies)
Hi,
I want to write a script which continuously checking status of a script running in background by nohup command. And if same script is not running then immediately start the script...please help..
i am using below command to run script
nohup system_traps.sh &
but in some... (9 Replies)
I am using blow script :--
#!/bin/bash
FIND=$(ps -elf | grep "snmp_trap.sh" | grep -v grep) #check snmp_trap.sh is running or not
if
then
# echo "process found"
exit 0;
else
echo "process not found"
exec /home/Ketan_r /snmp_trap.sh 2>&1 & disown -h ... (1 Reply)
Hello,
I have a directory where sometimes appear a certain file name - and I'd like to be notified by email when that happens... so what command or script I may use?
e.g. if there's a file named "adam" in the directory named "dir1" then send a mail to "abc@abc.com".. it needs to permanently... (5 Replies)
Discussion started by: netrom
5 Replies
LEARN ABOUT REDHAT
crond
CRON(8) System Manager's Manual CRON(8)NAME
cron - daemon to execute scheduled commands (Vixie Cron)
SYNOPSIS
cron
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
SEE ALSO crontab(1), crontab(5)AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 20 December 1993 CRON(8)