Linux/Unix Check File Growth

Project Notes

Check the level of byte growth of a file for a time interval.
Also, check that a file is growing.

Options:
-f Specify filename as full path
-i <int> Interval in seconds
-M <command> Command to use for the checks
"wc/stat" wc is portable but slower, stat is faster but less portable
-T <type> Type of concern for thresholds
"bigger/smaller" than thresholds
-c <int> Critical threshold in bytes
-w <int> Warning threshold in bytes

Usage: $0 -f big.log -M stat -T bigger -c 1000000 -w 5000000 -i 30

# Author: Jon Schipp
# Date: 11-07-2013
########
# Examples:

# 1.) Check if file has grown in the last 30 seconds
# $ ./check_file_growth.sh -f /var/log/system.log -M stat -i 30
# File grew by 118 bytes
#
# 2.) If file has grown by more than (c)ritical or (w)arning bytes in 30 seconds exit with critical or warning status. Use the stat program to check the bytes.
# $ ./check_file_growth -f big.log -M stat -T bigger -c 1000000 -w 5000000 -i 30