Question

awk shell script cannot run properly in crontab

Asked by: mikekwok

I tried to run the following script in command prompt in UNIX , it works fine.
cal 8 2006 | grep -v "[A-Z]" | cut -c4-17 | awk -f /aaa/home/scripts/aaa_oli_valo_all/formatit.awk - 8 2006 >  /aaa/home/scripts/aaa_oli_valo_all/1.txt

The output (1.txt) is as follow:
01/08/2006
02/08/2006
03/08/2006
04/08/2006
07/08/2006
08/08/2006
09/08/2006
10/08/2006
11/08/2006
14/08/2006
15/08/2006
16/08/2006
17/08/2006
18/08/2006
21/08/2006
22/08/2006
23/08/2006
24/08/2006
25/08/2006
28/08/2006
29/08/2006
30/08/2006
31/08/2006

However when i try to run it in crontab, the following output is generated:
awk: can't open 8
 record number 6
01//
02//
03//
04//
07//
08//
09//
10//
11//
14//
15//
16//
17//
18//
21//
22//
23//
24//
25//
28//
29//
30//
31//

Please suggest a solution for solving the problem. Thanks.

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2006-09-05 at 01:29:51ID21978033
Tags

awk

,

run

,

script

,

shell

Topic

Unix Systems Programming

Participating Experts
2
Points
100
Comments
15

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. Awk
    I have a long string of text, for example: A12345678917/02/00Mr Smith I need to create an output file with each value on a separate line. The values are either text, numeric or dates etc and are fixed widths. I have tried using awk and substr to select the first 10 charac...
  2. crontab is not working
    [simplewarez@dustpuppy simplewarez]$ crontab -l # DO NOT EDIT THIS FILE - edit the master and reinstall. # (/home/simplewarez/cronjobs installed on Fri Sep 29 07:13:29 2000) # (Cron version -- $Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $) 0 0,2,4,6,8,10,12,14,16,18,2...
  3. awk
    Hello everyone, well here is my story, we have an AIX box that runs version 4 but when I try to use awk as a regular command I can't because in order for me to be abel to execute a command using awk like who | awk '{print $?}' I have actually write a shell script ex: #!/usr/b...
  4. crontab listings
    As a user, you can type: crontab -l to see your scheduled contabs. I was wondering (if you are root) if there is a way to list every users' crontabs? =-=-=-=-=-=-=-= Hmm...This question should have been posted in the UNIX section instead. My crontab doesn't have a -u par...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: JulieBouillonPosted on 2006-09-05 at 01:37:18ID: 17454083

Could you try like this:
cal 8 2006 | grep -v "[A-Z]" | cut -c4-17 | awk -f /aaa/home/scripts/aaa_oli_valo_all/formatit.awk - >  /aaa/home/scripts/aaa_oli_valo_all/1.txt

I assume the parameters "8 2006" are not needed by your awk script. In fact if you specify "8 2006" the way you did, awk will try to open first the file - (which is the ouput of the pipe), then the file 8 and finally the file 2006.

 

by: ahoffmannPosted on 2006-09-05 at 04:19:43ID: 17454760

please post the crontab line
try to use full path to all program in your crontab

 

by: mikekwokPosted on 2006-09-05 at 20:14:24ID: 17460479

I can't omit the "8 2006" after formatit.awk in the script because it will generate the output with missnig the month and year.
Please help me.

 

by: mikekwokPosted on 2006-09-05 at 20:25:03ID: 17460510

The crontab line is as follow:

22 16 05 09 * cal 8 2006 | grep -v "[A-Z]" | cut -c4-17 | awk -f /aaa/home/scripts/aaa_oli_valo_all/formatit.awk - 8 2006 > /aaa/home/scripts/aaa_oli_valo_all/1.txt 2>&1

 

by: JulieBouillonPosted on 2006-09-05 at 21:46:29ID: 17460747

>I can't omit the "8 2006" after formatit.awk in the script because it will generate the output with missnig the month and year.
Looks like 8 and 2006 are parameters for formatit.awk and not input file. In this case you need to modify your call to awk in something like the following:
awk -f /aaa/home/scripts/aaa_oli_valo_all/formatit.awk -v month=8 -v year=2006 > /aaa/home/scripts/aaa_oli_valo_all/1.txt 2>&1

Replace "month" and "year" by the name of the variables you use in your script for the month and year.

 

by: ahoffmannPosted on 2006-09-05 at 23:42:09ID: 17461097

> The crontab line is as follow:
please use full path to all programs in crontab and try again

 

by: mikekwokPosted on 2006-09-06 at 02:21:06ID: 17461633

My formatit.awk is as follow:

BEGIN {
     MON=ARGV[2]
     if ( length(MON) == 1 ){
        MON= "0" MON
     }
     YEAR=ARGV[3]
}
{
     for (i=1; i<=NF; i++)
         if (length($i)==1){
            print "0" $i "/" MON "/" YEAR;
         }else{
            print $i "/" MON "/" YEAR;
         }
}


Would you advise me how to se the parameters ? Thanks.

 

by: ahoffmannPosted on 2006-09-06 at 02:59:10ID: 17461775

>  MON=ARGV[2]
what should this do?
awk has no ARGV, gawk has.
But if you want to pass parameters to the awk program itself (beside the text it should process), you better use gawk with its -v option.

As I suggested several times now: please use full path to awk. I guess that your cron uses tradtional AT&T awk while in your shell you use gawk (probably aliased or found in PATH first). Please correct me if I'm wrong.

 

by: JulieBouillonPosted on 2006-09-06 at 15:22:48ID: 17466857

Try the following:
cal 9 2006 | grep -v "[A-Z]" | cut -c4-17 | awk -v mon=9 -v year=2006 '{for (i=1;i<=NF;i++) printf "%02d/%02d/%d\n", $i, mon, year;}'

As ahoffmann as already suggested, you probably have different 'flavor' of awk (e.g. awk, nawk, gawk, ...) on your system and that's the reason why he suggest you to set the full path to awk. If you don't know which version you use, when you are connected in the shell simply issue a "which awk" command. This command will display the full path to awk.

For example:
$ which awk
/usr/bin/awk
$

Now that you know the full path to awk, just edit your crontab like this:
22 16 05 09 * cal 8 2006 | grep -v "[A-Z]" | cut -c4-17 | /usr/bin/awk -f /aaa/home/scripts/aaa_oli_valo_all/formatit.awk - 8 2006 > /aaa/home/scripts/aaa_oli_valo_all/1.txt 2>&1

or

22 16 05 09 * cal 9 2006 | grep -v "[A-Z]" | cut -c4-17 | /usr/bin/awk -v mon=9 -v year=2006 '{for (i=1;i<=NF;i++) printf "%02d/%02d/%d\n", $i, mon, year;}' > /aaa/home/scripts/aaa_oli_valo_all/1.txt 2>&1

 

by: ahoffmannPosted on 2006-09-06 at 23:49:30ID: 17468578

> ..and that's the reason why he suggest you to set the full path to awk.
It's one reason, another is that crontab has a very limited environment (including PATH), hence I suggest that *all* programs are used with full path.
Just to be more precise :)

BTW, /usr/bin/awk on non-Linux systems is most likely AT&T awk which has no -v.
A simple test is
  awk -V
if you get an (bailing out ...) error it's old fashioned awk, if you get usage most likely gawk.

 

by: mikekwokPosted on 2006-09-08 at 02:20:10ID: 17477960

I still got error......

here is the script ....

the filename is called "gen_weekday.sh"

#!/bin/ksh
MON=`date '+%m'`
YEAR=`date '+%Y'`
if [ $MON -eq 1 ]
then
   MON=12
   YEAR=`expr $YEAR - 1`
else
   MON=`expr $MON - 1`
fi
cal $MON $YEAR | grep -v "[A-Z]" | cut -c4-17 | awk -v mon=$MON -v year=$YEAR '{for (i=1;i<=NF;i++) printf "%02d/%02d/%d\n", $i, mon, year;}'



in crontab

11 17 08 09 * /aaa/home/scripts/gen_weekday.sh > /aaa/home/scripts/date.txt 2>&1

the date.txt contains the error:
awk: syntax error near line 1
awk: bailing out near line 1


Please suggest me how to solve the problem. Thanks.

 

by: ahoffmannPosted on 2006-09-08 at 03:33:18ID: 17478181

mikekwok, why do you not follow the suggestions?

 

by: JulieBouillonPosted on 2006-09-08 at 05:53:26ID: 17478860

Do the following command:
AWK=`which awk` && mv /aaa/home/scripts/gen_weekday.sh /aaa/home/scripts/gen_weekday.old && sed "s#awk#$AWK#g" /aaa/home/scripts/gen_weekday.old > /aaa/home/scripts/gen_weekday.sh

Everything on the same line please.

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...