Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Parsing cron data with awk
Top Forums Shell Programming and Scripting Parsing cron data with awk Post 302766483 by Don Cragun on Monday 4th of February 2013 10:17:07 PM
Old 02-04-2013
Quote:
Originally Posted by Chubler_XL
A cronjob that runs every 6 mins would look like (V7 standard)
Code:
0,6,12,18,24,30,36,42,48,54 * * * *

or
Code:
0-54/6 * * * *

You should also consider some of these (should they be listed or not?):
Code:
* * * * 2 # every min on tuesdays
20-30 * * * * * # every min between 20 and 30 past hour
2-58/2 9-17 * * * # every 2 mins 9am - 5pm

Many systems still don't support / in the time fields (so check your cron and crontab man pages before worrying about /.

If your system supports / and one appears in the first field and the number after the / is less than 15, flag it.
Otherwise, if there is a - in the first field, flag it.
Otherwise, if there are one or more commas in the first field, sort the values separated by the commas and if the difference between any two adjacent values in the sorted list is less than 15, flag it. If the difference between the last value in the list and the (1st value in the list + 60) is less than 15, you have to determine if the hour field will ever yield consecutive hours. If it does, flag it. (Note that consecutive hours could also be hour 23 on one day and hour 0 on the next day, ... ... ...) Sorting the values in the minutes field is necessary because a minutes field of:
Code:
0,20,40,10,50,30

results in the job running every 10 minutes, but no two adjacent values are within 15 minutes of each other.

The logic isn't that hard, but there are enough special cases about which fields are considered depending on which fields have values specified in a crontab entry that this is not going to be a trivial task.

Good luck.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Parsing XML dynamic data via awk?

I am trying to use a line of output in an XML file as input in another new XML file for processing purposes via a shell script. Since I am a newbie though, I'm not sure how to do this since the data is different everytime. I am using this technique with static data right now: echo -n "Running... (5 Replies)
Discussion started by: corwin43
5 Replies

2. Shell Programming and Scripting

Parsing the data

Hi I need to parse the following data using shell script Table ----- stage4n_abc 48 stage4o_abcd 4 adashpg_abc_HeartBeat 1 stage4l_asc 168 Can anyone gimme the solution. I want each value to get stored in an array or variable and want the value to be greped from another file.... (1 Reply)
Discussion started by: Archana.Dheepan
1 Replies

3. Shell Programming and Scripting

Question about Awk for Data Parsing

Hi, I am doing some data parsing for some economics research. I was recently exposed to shell script and am brand new to awk. I have a large csv file (like 10G) and I would like to make it a lot smaller with awk, but it is a bit tricky for me and I haven't been able to get it yet. I would... (5 Replies)
Discussion started by: EconResearch
5 Replies

4. Shell Programming and Scripting

Parsing data

Hi all , I have a file with billing CDR records in it. I need to parse that information (row format) . The purpose is to compare full content. The example I have given below is a single line record but it has two portions, (1) the line start with “!” and end with “1.2.1.8” and (2) second part... (5 Replies)
Discussion started by: jaygamini
5 Replies

5. Shell Programming and Scripting

Parsing cron with sed

Hello I want to convert my cron list into a csv Can you please help me with sed ? eg: Convert #06,21,36,51 * * 1,2 * (. ~/.profile ; timex /some/path/script -30 -15) >> /some/path/logfile2 2>&1 * * * * * (. ~/.profile ; timex /some/path/script2) > /some/path/logfile2 To:... (1 Reply)
Discussion started by: drbiloukos
1 Replies

6. Shell Programming and Scripting

Parsing the data

Hi friends, I need to parse the following data in the given format and get the desired output. I need a function, which takes the input as a parameter and the desired output will be returned from the function. INPUT(single parameter as complete string) A;BCF;DFG;FD ... (3 Replies)
Discussion started by: sumesh.1988
3 Replies

7. Shell Programming and Scripting

Help in Parsing data

I have below string Transaction_ID:SDP-DM-151204679 , Transaction_DateTime:2011-02-11 00:00:15 GMT+05:30 , Transaction_Mode:WAP , Circle_ID:4 , Circle_Name:BJ ,Zone: , CustomerID:B_31563486 , MSISDN:7870904329 , IMSI:405876122068099 , IMEI: , Sub_Profile:Pre-Paid , CPID:Nazara , CPNAME:Nazara ,... (6 Replies)
Discussion started by: poweroflinux
6 Replies

8. Shell Programming and Scripting

Data parsing

Hi, I do have a data file which is divided into compartments by ---------. I would like to extract (parse) some of the data and numbers either using awk or sed The file has the format: CATGC Best GO enrichment: Genes/ORF that have the motifs (genes are sorted by max(pa+pd+po)): ... (6 Replies)
Discussion started by: Lucky Ali
6 Replies

9. Shell Programming and Scripting

Help with parsing data with awk , eliminating unwanted data

Experts , Below is the data: --- Physical volumes --- PV Name /dev/dsk/c1t2d0 VG Name /dev/vg00 PV Status available Allocatable yes VGDA 2 Cur LV 8 PE Size (Mbytes) 8 Total PE 4350 Free PE 2036 Allocated PE 2314 Stale PE 0 IO Timeout (Seconds) default --- Physical volumes ---... (5 Replies)
Discussion started by: rveri
5 Replies

10. Shell Programming and Scripting

Parsing XML (and insert data) then output data (bash / Solaris)

Hi folks I have a script I wrote that basically parses a bunch of config and xml files works out were to add in the new content then spits out the data into a new file. It all works - apart from the xml and config file format in the new file with XML files the original XML (that ends up in... (2 Replies)
Discussion started by: dfinch
2 Replies

LEARN ABOUT OSX

sa2

sa2(8)							    BSD System Manager's Manual 						    sa2(8)

NAME

     sa2 -- Generate a system activity daily report file.

SYNOPSIS

     /usr/lib/sa/sa2 [-dgpu] [-n mode] [-e time] [-f filename] [-i seconds] [-s time]

DESCRIPTION

     The sa2 command is a shell script used to invoke the system activity reporter sar for purposes of generating the standard default daily
     report file.  The report file generated is, /var/log/sa/sardd where the dd represents the current day of the month.  The sa2 options are the
     same as those documented in sar(1).

     When sa2 runs, it will also remove data and report files, found in /var/log/sa, that are more than one week old.

     The sa2 command is intended to be started by cron.

EXAMPLE CRON ENTRY

     # Starting at 8am collect system activity records
     # every 20 minutes for 12 hours
     # 20 minutes = 1200 seconds
     # 12 hours with 3 samples each hour = 36 loops

     0 8 * * 1-5 /usr/lib/sa/sa1 1200 36

     # After the 12 hour period,
     # collect a system activity report

     30 20 * * 1-5 /usr/lib/sa/sa2 -A

FILES

     /var/log/sa/sardd	Default daily report file.
     /var/log/sa/sadd	Default daily data file.

			dd are digits that represent the day of the month.

SEE ALSO

     crontab(1), fs_usage(1), netstat(1), sar(1), sc_usage(1), top(1), vm_stat(1), crontab(5), iostat(8), sa1(8), sadc(8)

Mac OS X							    Jul 25 2003 							  Mac OS X
All times are GMT -4. The time now is 07:10 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy