I need a script which needs to look in a way that take copy of the current crontab in a file then every day a cron tab copy needs to be taken and it needs to compare using "diff" command if it is not matching it needs to send alert mail.Can any one please help me on this?
Currently I'm using the below script But issue with this script is it sends alerts even if the Changes made in the crontab are correct.But I want to compare the contents using the diff command.So this script not suits for my requirement
#!/bin/sh
export smtp=smtprelay.intra.coriant.com:25
CROND=/home/ssx00001
ALERT=redmine#coriant.com
checkf=last.crontab.check
if [ -f $checkf ]
then
find $CROND -type f -newer $checkf | while read tabfile
do
echo "Crontab file for Redmine has changed" | mail -s "Crontab changed" $ALERT
done
fi
touch $CHECKF
#!/bin/sh
export smtp=smtprelay.intra.coriant.com:25
ALERT=redmine#coriant.com
crontab -l > /home/ssx00001/y.txt
cat y.txt
diff /home/ssx00001/x.txt /home/ssx00001/y.txt > /home/ssx00001/z.txt
ab=`cat z.txt | wc -l`
echo $ab
if [[ $ab != 0 ]]; then
echo "Crontab for Redmine has changed" | mail -s "Crontab modified" $ALERT
fi
(/home/ssx00001 is the path in which files stored ?)
Also create a file in /home/ssx00001 as x.txt which contains data of current cronjobs
The problem you have is that the diff command requires two files to compare. You cannot check for changes in a file without saving an old version of the file to check against. The crontab command does not do this.
Your best bet is to write a wrapper around the crontab command which saves a copy of the original crontab file, runs crontab to edit and install the new file, and then runs diff with the file you saved.
Related
inotify seems to add a 6 letter code to filenames in its output, before the extension.
For example:
"/path/to/directory/ CLOSE_WRITE,CLOSE filename-HzdVai.lyx"
or with --format "%w%f":
/path/to/directory/filename-HzdVai.lyx
This didn't happen with other scripts and I couldn't find any example of this or why this would happen with googling.
code:
inotifywait -m -r -e close_write --exclude '[^l][^y][^x]$' ~/Routines/* ~/Projects/* | while read path msg name
do
echo "$path $msg $name"
lyx -e pdf "$path$name.lyx"
done
If it's relevant, I am using Ubuntu 20.4.
The intention of the script was to continuously update LyX documents matching pdf files (LyX is a LaTeX-based document processor) so whenever I saved a document it would be compiled automatically
#larks had guessed correctly and tracking move events as well showed that LyX just wrote to the file with the id temporarily, then renamed it.
The final, working, script:
#!/usr/bin/env sh
inotifywait -m -r -e moved_to --exclude '[^l][^y][^x]$' --format "%w%f" ~/Routines/* ~/Projects/* | while read file_path
do
echo "$file_path"
lyx -e pdf "$file_path"
done
I am trying to make a script what looks at a folder and will automatically encode files that go into that folder using hand brake. I want to do this doing monitoring the folder using inotify putting the new additions to the folder into a list then using a cron job to encode them overnight. However when using a while loop to loop over the list handbrake only encodes the first file exists then the scripts carrys on to after the loop without doing every file in the list. Here is the script that is calling handbrake:
#!/bin/bash
while IFS= read -r line
do
echo "$(basename "$line")"
HandBrakeCLI -Z "Very Fast 1080p30" -i "$line" -o "$line.m4v"
rm "$line"
done < list.txt
> list.txt
When testing the loop with a simple echo instead of the HandBrakeCLI it works fine and prints out every file so I have no idea what is wrong.
Here is the scripts that is monitoring the folder incase that is the problem:
#!/bin/bash
if ! [ -f list.txt ]
then
touch list.txt
fi
inotifywait -m -e create --format "%w%f" tv-shows | while read FILE
do
echo "$FILE" >> list.txt
done
Any help would be great, thanks
EDIT:
Just to be more specific, the script works fine for the first file in the list.txt, it encodes it no problem and removes the old version, but then it doesn't do any of the others in the list
Taken from here
To solve the problem simply
echo "" | HandBrakeCLI ......
or
HandBrakeCLI ...... < /dev/null
I need a script that will check any modification in the /etc/passwd file, if there's a modification I get alerted immediately via email telling me that a user that has been added or removed from the passwd file
Without using inotifywait command
You could use the inotifywait utility, something like this:
inotifywait -e modify /etc/passwd
inotifywait will exit when the selected file is written, so you can take whatever action you need.
you could check for modifications with md5sum or sha256...
make your base checksum, hardcode it in a scrip
if [[ "$(sha256 /etc/passwd)" != "the hash of ori file" ]]; then
mail yourself
fi
you could also have a copy of /etc/passwd somewhere and run a diff that you send by mail as to have the content of the changes
if [[ "$(diff /etc/passwd /root/passwdbackup)" != "" ]]; then
mail yourself
fi
Hi I Need a script to monitor the cron entries and if there is any change in the crontab entry it needs to alert me.
For this I have used the method by taking a copy of current crontab then it needs to compare the crontabs every day.If there is any alteration found it needs to alert me.Is this possible?
Currently I'm using crontab -l > $(date +%Y%m%d).crontab command to take copy every day and I think diff command can do the comparison
can any one please help?
You could try something like below script
CRDI=/var/spool/cron/crontabs
CHECKF=/tmp/last.crontab.check
ALERT=iam#userhost
if [ -f $CHECKF ]
then
find $CRDI -type f -newer $CHECKF | while read tabfile
do
echo "Crontab file for user $(basename $tabfile) has changed" | mail -s "Crontab changed" $ALERT
done
fi
touch $CHECKF
I finally got the answer Thanks for your efforts
Hi, I finally got the answer Thanks for your efforts
#!/bin/sh
export smtp=smtprelay.intra.xxxx.com:25
ALERT=redmine#xxxx.com
crontab -l > /home/ssx00001/y.txt
cat y.txt
diff /home/ssx00001/x.txt /home/ssx00001/y.txt > /home/ssx00001/z.txt
ab=`cat z.txt | wc -l`
echo $ab
if [[ $ab != 0 ]]; then
echo "Crontab for xxxx has changed" | mail -s "Crontab modified" $ALERT
fi
I have a simple php page that writes a file to my server.
// open new file
$filename = "$name.txt";
$fh = fopen($filename, "w");
fwrite($fh, "$name".";"."$abbreviation".";"."$uid".";");
fclose($fh);
I then have a cron job that I know runs as root as test that and need that.
if [[ $EUID -ne 0 ]]; then
echo "This script must be run as root" 1>&2
exit 1
fi
The cronjob is a bash script that can detect the file exists, but it can't seem to read the contents of the file.
#!/bin/bash
######################################################
#### Loop through the files and generate coincode ####
######################################################
for file in /home/test/customcoincode/queue/*
do
echo $file
chmod 777 $file
echo "read file"
while read -r coinfile; do
echo $coinfile
echo "Assign variables from file"
#############################################
#### Set the variables to from the file #####
#############################################
coinName=$(echo $coinfile | cut -f1 -d\;)
coinNameAbreviation=$(echo $coinfile | cut -f2 -d\;)
UId=$(echo $coinfile | cut -f3 -d\;)
done < $file
echo "`date +%H:%M:%S` - $coinName : Your Kryptocoin is being compiled!"
echo $file
echo "copy $coinName file to generated directory"
cp -b $file /home/test/customcoincode/generatedCoins/$coinName.txt
echo "`date +%H:%M:%S` : Delete queue file"
# rm -f $file
done
echo $file recognises the file exists
echo $coinfile is blank
Yet when I nano ./coinfile.txt in terminal I can see clearly there is text in there
I run ls -l and I see that the file has the permissions
-rw-r--r-- 1 www-data www-data
I was under the impression that this would still mean the file can be read by other users?
Do I need to be able to execute the file if i am opening it and reading the contents?
Any advice would be greatly appreciated. I can expand and show my code if you want, but it was working before when I called a bash script to write the file... and that time it would save the file under root user with rwx for most and then could be read. But this then caused other issues in the php page, so is not an option.
You have:
while read -r coinfile; do
...
I see no indication that you're reading from $file. The command
read -r coinfile
will simply read from standard input (the -r merely affects the treatment of backslashes). In a cron job, if I recall correctly, standard input is empty or unavailable, which would explain why $coinfile is empty.
If you actually do read from $file -- for example, if your real code looks something like:
while read -r coinfile; do
...
done <$file
then you need to show us your entire script, or at least a self-contained version of it that exhibits the problem. Actually, you need to show us your entire script whether that's the problem or not.
http://sscce.org/