How to monitor Linux directory file changes using the shell

Recently saw a group of people chatting to their server has recently been Hung horse, and then want to use a script to monitor the Web directory changes in real-time files, that is, the directory of additions and deletions to the corresponding log records.

At that time feel this function is really a bit interesting, so I looked up some information on the Internet, I studied the next, now have time to write a script, to share with you, if there is a problem, but also please point out.

I've written two scripts below:

Script 1: Save the original state of the directory that needs to be monitored to log logs

Script 2: Compare the original state of script 1 with this script, and save the changed content to the log if the directory file changes.

Note: The principle actually utilizes the DU-SB output value to judge the file change, then uses the diff to carry on the comparison.

1. To save the original state before executing the script:

# VI initial.sh

-------------------

#!/bin/bash

Path=/bin:/sbin:/usr/bin:/usr/sbin/:/usr/local/bin:/usr/local/sbin:~/bin

Export PATH

# The Directory to monitor

Dir=/root

# Temporary files

Tmp_a=/tmp/a.txt

# traverse the file size and path in the specified directory and redirect to the log file

Find $DIR-print0 | xargs-0 DU-SB > $TMP _a

-------------------

2. Execute the Monitoring script

# VI monitor.sh

-------------------

#!/bin/bash

Path=/bin:/sbin:/usr/bin:/usr/sbin/:/usr/local/bin:/usr/local/sbin:~/bin

Export PATH

# The Directory to monitor

Dir=/root

# Date Variable

Date= ' Date +%f_%h:%m '

# Temporary files

Tmp_a=/tmp/a.txt

Tmp_b=/tmp/b.txt

Tmp_c=/tmp/c.txt

# log file

Log=/var/log/filemodify.log

# traverse the file size and path in the specified directory and redirect to the log file

Find $DIR-print0 | xargs-0 DU-SB > $TMP _b

# Compare directory changes and write changed files to log

diff=$ (diff $TMP _a $TMP _b)

if [[Z $DIFF]];

Then

echo "Nothing Change" >> $LOG

Else

echo "Here's the change" >> $LOG

echo "" >> $LOG

echo "$DIFF" |awk ' {print $} ' |sort-k2n |uniq |sed '/^$/d ' |tee $TMP _c >> $LOG

If [-S $TMP _c];

Then

echo "" >> $LOG

echo "It modified at $DATE" >> $LOG

# Overwrite the current monitored directory structure with the initial state

Find $DIR-print0 | xargs-0 DU-SB > $TMP _a

Fi

Fi

echo "====================================" >> $LOG

#Clean up temporary files

RM-RF $TMP _b $TMP _c

--------------------

Author: 51cto Blog All the way north

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/OS/Linux/