Homework 2
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Elementary knowledge of GIT, BASH, C++ will be tested.
Task may be completed on any Linux distribution (recommended debian/ubuntu)
GIT
- Save work progress in a repository
- For example github.com
- Use branches (help)
- One branch for implementing bash script and another branch for c++
- commit often, total number of commits should be 10+
- when checking out a random revision, it should compile.
- Branches start from master and must be merged back into master
BASH
Script 1 - Show memory usage
Script has 1 optional argument, path to meminfo file (contains current memory status). If it's not provided use /proc/meminfo
Use standard unix tools like awk, grep, sed to parse the input file.
Example of input file
cat /proc/meminfo MemTotal: 7969612 kB MemFree: 4582768 kB Buffers: 707368 kB Cached: 1122984 kB SwapCached: 0 kB Active: 1742408 kB Inactive: 1203472 kB [ ... ]
output:
./script1.sh /proc/meminfo RAM: 4582 MB used / 7969 MB total ( 3387 MB free)
Script 2 - compile c++ application
Compiles the C++ application Probably only has 1 useful line, g++ with some linker options.
example:
./script2.sh Compilation started Compilation finished
C++
Parse log file for invalid time stamps
Write a program that parses the provided example log file, Media:Ex_log.gz and checks for anomalies in time stamps (if the newer log line has an older time stamp). The normal behavior is that the time increases with each line downwards as shown below
2015-02-19 17:33:08.584 [INFO] Gateway.port9.db - (122) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.583703, received 2015-02-19 17:33:08.585 [INFO] Gateway.port6.db - (41) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.585024, received 2015-02-19 17:33:08.586 [INFO] Gateway.port6.db - (42) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.585943, received 2015-02-19 17:33:08.598 [INFO] Gateway.Port15.db - (40) event: 1 flags: GwTime GI time: 2015-Feb-19 17:33:08.551947, sent 2015-02-19 17:33:08.599 [INFO] Gateway.Port15.db - (120) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.528113, sent 2015-02-19 17:33:08.604 [INFO] Gateway.port9.db - (123) event: 1 flags: GwTime GI time: 2015-Feb-19 17:33:08.603814, received 2015-02-19 17:33:08.606 [INFO] Gateway.port6.db - (43) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.586459, received 2015-02-19 17:33:08.607 [INFO] Gateway.port6.db - (44) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.606645, received 2015-02-19 17:33:08.607 [INFO] Gateway.port6.db - (45) event: 2 flags: GwTime GI time: 2015-Feb-19 17:33:08.607344, received
An erroneous log would look like the next short example
2015-02-19 17:33:08.790 [INFO] Gateway.port10.db - (128) event: 1 time: 2015-Feb-19 17:31:58.520000, received 2015-02-19 17:33:08.792 [INFO] Gateway.WebServer.db - (128) event: 1 time: 2015-Feb-19 17:31:58.520000, sent 2015-02-19 11:23:08.808 [INFO] Gateway.Port15.db - (128) event: 1 time: 2015-Feb-19 17:31:58.520000, sent 2015-02-19 11:23:08.812 [INFO] Gateway.port10.db - (129) event: 1 time: 2015-Feb-19 17:31:58.855000, received 2015-02-19 11:23:08.814 [INFO] Gateway.WebServer.db - (129) event: 1 time: 2015-Feb-19 17:31:58.855000, sent 2015-02-19 11:23:08.815 [INFO] Gateway.port10.db - (130) event: 1 time: 2015-Feb-19 17:31:58.176000, received 2015-02-19 11:23:08.817 [INFO] Gateway.WebServer.db - (130) event: 1 time: 2015-Feb-19 17:31:58.176000, sent 2015-02-19 17:33:08.817 [INFO] Gateway.port10.db - (131) event: 1 time: 2015-Feb-19 17:31:58.091000, received 2015-02-19 17:33:08.837 [INFO] Gateway.Port15.db - (129) event: 1 time: 2015-Feb-19 17:31:58.855000, sent
Note that year-month-day could also be 'wrong'.
2015-02-19 17:33:08.895 [INFO] Gateway.port7.db - (54) event: -0.058075 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.895493, received 2015-02-19 17:33:08.897 [INFO] Gateway.port8.db - (81) event: 0.771538 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.896834, received 2015-02-19 17:33:08.898 [INFO] Gateway.port8.db - (82) event: 0.541642 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.897743, received 2012-01-15 17:33:08.898 [INFO] Gateway.port8.db - (83) event: -0.523254 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.898286, received 2012-01-15 17:33:08.899 [INFO] Gateway.port8.db - (84) event: -0.142151 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.898931, received 2012-01-15 17:33:08.899 [INFO] Gateway.port8.db - (85) event: 0.0126041 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.899393, received 2015-02-19 17:33:08.900 [INFO] Gateway.port8.db - (86) event: 0.0643635 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.899999, received 2015-02-19 17:33:08.900 [INFO] Gateway.port8.db - (87) event: -0.507019 flags: GwTime GI Normalized time: 2015-Feb-19 17:33:08.900444, received
Or both...
Program accepts one out of three optional arguments: stats, list or all. Examples
./a.out filename --stats ./a.out filename ./a.out filename --all
--stats
Outputs statistical information about time stamp anomalies.
--list
Outputs lines with erroneous time stamps along with line numbers.
--all
Outputs lines with erroneous time stamps along with line numbers
and statistical information about time stamp anomalies
Examples
A short example log file
2015-02-19 13:28:33.778 [INFO] Gateway.Port15.db - (35) event: 2 time: 2015-Feb-19 17:32:02.013000, sent 2015-02-19 13:28:33.778 [INFO] Gateway.Port15.db - (133) event: 2 time: 2015-Feb-19 17:31:52.336000, sent 2015-02-19 13:28:33.788 [INFO] Gateway.WebServer.db - (36) event: 1 time: 2015-Feb-19 17:32:01.386000, sent 2015-02-19 13:28:33.791 [INFO] Gateway.WebServer.db - (134) event: 2 time: 2015-Feb-19 17:31:52.030000, sent 2015-02-19 13:28:33.797 [INFO] Gateway.port10.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, received 2015-02-19 13:28:33.795 [INFO] Gateway.port6.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, received 2015-02-19 13:28:33.804 [INFO] Gateway.WebServer.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, sent 2015-02-19 11:28:33.805 [INFO] Gateway.port10.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, received 2015-02-19 11:28:33.806 [INFO] Gateway.WebServer.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, sent 2015-02-19 11:28:33.807 [INFO] Gateway.Port15.db - (36) event: 1 time: 2015-Feb-19 17:32:01.386000, sent 2015-02-19 11:28:33.807 [INFO] Gateway.Port15.db - (134) event: 2 time: 2015-Feb-19 17:31:52.030000, sent 2015-02-19 13:28:33.808 [INFO] Gateway.Port15.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, sent 2015-02-19 13:28:33.810 [INFO] Gateway.port6.db - (38) event: 2 time: 2015-Feb-19 17:32:01.744000, received 2015-02-19 13:28:33.813 [INFO] Gateway.WebServer.db - (38) event: 2 time: 2015-Feb-19 17:32:01.744000, sent 2015-02-19 13:28:33.814 [INFO] Gateway.WebServer.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, sent 2015-01-19 13:18:33.819 [INFO] Gateway.Port15.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, sent 2015-01-19 13:18:33.819 [INFO] Gateway.Port15.db - (38) event: 2 time: 2015-Feb-19 17:32:01.744000, sent 2015-01-19 13:18:33.820 [INFO] Gateway.Port15.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, sent 2015-02-19 13:28:33.821 [INFO] Gateway.port10.db - (137) event: 2 time: 2015-Feb-19 17:31:52.637000, received 2015-02-19 13:28:33.823 [INFO] Gateway.WebServer.db - (137) event: 2 time: 2015-Feb-19 17:31:52.637000, sent 2015-02-19 13:28:33.824 [INFO] Gateway.port6.db - (39) event: 2 time: 2015-Feb-19 17:32:02.451000, received 2015-02-19 13:28:33.826 [INFO] Gateway.WebServer.db - (39) event: 2 time: 2015-Feb-19 17:32:02.451000, sent
$ ./a.out example_log --stats Number of lines: 22 Invalid time stamps at line(s): 6 8-11 16-18
$ ./a.out example_log --list Lines with invalid time stamps: [7] 2015-02-19 13:28:33.804 [INFO] Gateway.WebServer.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, sent [8] 2015-02-19 11:28:33.805 [INFO] Gateway.port10.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, received [9] 2015-02-19 11:28:33.806 [INFO] Gateway.WebServer.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, sent [10] 2015-02-19 11:28:33.807 [INFO] Gateway.Port15.db - (36) event: 1 time: 2015-Feb-19 17:32:01.386000, sent [11] 2015-02-19 11:28:33.807 [INFO] Gateway.Port15.db - (134) event: 2 time: 2015-Feb-19 17:31:52.030000, sent [12] 2015-02-19 13:28:33.808 [INFO] Gateway.Port15.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, sent --- [15] 2015-02-19 13:28:33.814 [INFO] Gateway.WebServer.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, sent [16] 2015-01-19 13:18:33.819 [INFO] Gateway.Port15.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, sent [17] 2015-01-19 13:18:33.819 [INFO] Gateway.Port15.db - (38) event: 2 time: 2015-Feb-19 17:32:01.744000, sent [18] 2015-01-19 13:18:33.820 [INFO] Gateway.Port15.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, sent [19] 2015-02-19 13:28:33.821 [INFO] Gateway.port10.db - (137) event: 2 time: 2015-Feb-19 17:31:52.637000, received
$ ./a.out example_log --all Number of lines: 22 Invalid time stamps at line(s): 8-11 16-18 Lines with invalid time stamps: [7] 2015-02-19 13:28:33.804 [INFO] Gateway.WebServer.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, sent [8] 2015-02-19 11:28:33.805 [INFO] Gateway.port10.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, received [9] 2015-02-19 11:28:33.806 [INFO] Gateway.WebServer.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, sent [10] 2015-02-19 11:28:33.807 [INFO] Gateway.Port15.db - (36) event: 1 time: 2015-Feb-19 17:32:01.386000, sent [11] 2015-02-19 11:28:33.807 [INFO] Gateway.Port15.db - (134) event: 2 time: 2015-Feb-19 17:31:52.030000, sent [12] 2015-02-19 13:28:33.808 [INFO] Gateway.Port15.db - (135) event: 2 time: 2015-Feb-19 17:31:52.035000, sent --- [15] 2015-02-19 13:28:33.814 [INFO] Gateway.WebServer.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, sent [16] 2015-01-19 13:18:33.819 [INFO] Gateway.Port15.db - (37) event: 2 time: 2015-Feb-19 17:32:01.157000, sent [17] 2015-01-19 13:18:33.819 [INFO] Gateway.Port15.db - (38) event: 2 time: 2015-Feb-19 17:32:01.744000, sent [18] 2015-01-19 13:18:33.820 [INFO] Gateway.Port15.db - (136) event: 1 time: 2015-Feb-19 17:31:52.090000, sent [19] 2015-02-19 13:28:33.821 [INFO] Gateway.port10.db - (137) event: 2 time: 2015-Feb-19 17:31:52.637000, received
If no arguments a given, output an error message: 'Input file missing'.
If no optional arguments are given, output is same as with stats argument.
Note that with list argument one line before and after the invalid time stamp is also output (look closer at the example outputs).
Program is output to 'standard output'.
Use boost libraries: format, date_time, filesystem.
MarkTomm 15. juuli 2015, kell 16:10 (EEST)