Weird Error moving a file


 
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# 1  
Weird Error moving a file

Hi,
We are running into very weird error on AIX. Target directory exists on NFS.

We have one script runs every 5 mins on our system. This script is running for 5 years for now without any issuess.

Followig is the snapshot of the script :

Code:
   stmt_cnt=$(ls -1 ${1}/${2}|wc -l) 
   if [ ${stmt_cnt} -ne 0 -a ${stmt_cnt} -lt 501 ]; then
     out_str="${out_str}\n$(date +"%Y%m%d%H%M%S"): Moving ${stmt_cnt} \"${2}\" statements from ${1} to ${3}\n"
     find ${1} -name "${2}" | sort -t"_" +7n +8n | xargs ksh -c 'mv $* '"${3}" foobar

Recently, mv command started failing only few occasions. Intrestingly, it is successful in the second run after failing in first run.

Following is the Error.

Code:
Usage: mv [-I] [ -d| -e] [-i | -f] [-E{force|ignore|warn}] [--] src target
   or: mv [-I] [-i | -f] [-E{force|ignore|warn}] [--] src1 ... srcN directory

Any guesses ? Appreciate pointers.

Last edited by Scott; 04-30-2012 at 04:52 PM.. Reason: Please use code tags
# 2  
Please post the exact parameters supplied to the script and mention what Shell this is.

Btw. What precisely is foobar in this context ?

It may have been running for 5 years but I for one cannot work out what this script is intended to do. Can you describe the process in words?
Please also post a complete script as this snippet reads as syntactically-incorrect nonsense.
# 3  
Wow! Didn't see that coming from a moderator.

How come it's syntactically-incorrect nonsense if it's working ?

Agreed, foobar is confusing here but works so syntax is not an issue

$1 = starting directory
$2 = pattern
$3 = destination

---------- Post updated at 05:02 PM ---------- Previous update was at 04:55 PM ----------

Question : Can system load be playing a role here ? Like output of find command not properly communicated to mv command and mv ends up with having empty string as src.

Code:
find ${1} -name "${2}" | sort -t"_" +7n +8n | xargs ksh -c 'mv $* '"${3}" foobar

Just speculating...

Last edited by methyl; 05-01-2012 at 10:27 AM.. Reason: please use code tags
# 4  
My guess is this:
If the total command line length is exceeded, then xargs calls the utility n times with fewer arguments. The first n-1 times with the maximum allowable line length and the last time with whatever remains. But since in this script the target directory is stuck on to the end, the total line length is exceeded for the mv command for the first n iterations, so these iterations of mv fail perhaps since the length is exceeded, or since the target directory is missing among it arguments. The last iteration gets passed what is left and thus had a lower line length and succeeds, so part of the files do get moved.

So the next time the script gets called, there are fewer files and this time there may be no error, because the total command line length does not get exceeded...

You could try lowering the command line length that xargs passes with the "-s" option.
# 5  
Thanks Scrutinizer. xargs wouldn't be an issue here. Interestingly, number of files to be processed are more second time around.

Example : 10 files came in, move failed all of them for the first run
Next Run 90 files came in.

All of 100 files got moved successfully for the second run. We have seen repetitions of the same behavior.

Last edited by methyl; 05-01-2012 at 06:58 PM.. Reason: correct spelling for readability
# 6  
Quote:
stmt_cnt=$(ls -1 ${1}/${2}|wc -l)
if [ ${stmt_cnt} -ne 0 -a ${stmt_cnt} -lt 501 ]; then
out_str="${out_str}\n$(date +"%Y%m%d%H%M%S"): Moving ${stmt_cnt} \"${2}\" statements from ${1} to ${3}\n"
find ${1} -name "${2}" | sort -t"_" +7n +8n | xargs ksh -c 'mv $* '"${3}" foobar
fi
The script needs urgent revision because it has some serious problems which may not produce syntax errors or error messages (?) but which cause alarming process anomalies due to command truncation in AIX. Have you counted the number of input files and compared with the number of output files?
I would suggest avoiding any unlimited xargs in AIX and executing comands one-by-one. Credit: Scrutinizer picked up on this.

Code:
stmt_cnt=$(ls -1 ${1}/${2}|wc -l) 
   if [ ${stmt_cnt} -ne 0 -a ${stmt_cnt} -lt 501 ]; then
     out_str="${out_str}\n$(date +"%Y%m%d%H%M%S"): Moving ${stmt_cnt} \"${2}\" statements from ${1} to ${3}\n"
     find ${1} -type f -name "${2}"|while read filename
     do
                mv "${filename}" "${3}"
     done
  fi

I have no idea what the sort is for and IMHO the ksh command line with the foobar is a botch to lose a surplus parameter when the command line is too long.
You clearly did not write this script but it is hard to justify that this script works despite the absence of reported syntax or other error messages.

Sorry to be so abrupt but that ksh line is a real problem.


Quote:
Agreed, foobar is confusing here but works so syntax is not an issue
Are you really sure? I'm not so sure.


Quote:
$1 = starting directory
$2 = pattern
$3 = destination
Let's assume that $3 is a pre-existing writeable directory. We don't know anything about $2, but that could be the subject of the next post.

Last edited by methyl; 05-01-2012 at 06:59 PM.. Reason: assorted corrections and addenda and footnote
# 7  
Quote:
Originally Posted by methyl
The script needs urgent revision because it has some serious problems which may not produce syntax errors or error messages (?) but which cause alarming process anomalies due to command truncation in AIX. Have you counted the number of input files and compared with the number of output files?
I would suggest avoiding any unlimited xargs in AIX and executing comands one-by-one. Credit: Scrutinizer picked up on this.

Yes, this script is working in production as intended.

Code:
stmt_cnt=$(ls -1 ${1}/${2}|wc -l) 
   if [ ${stmt_cnt} -ne 0 -a ${stmt_cnt} -lt 501 ]; then
     out_str="${out_str}\n$(date +"%Y%m%d%H%M%S"): Moving ${stmt_cnt} \"${2}\" statements from ${1} to ${3}\n"
     find ${1} -type f -name "${2}"|while read filename
     do
                mv "${filename}" "${3}"
     done
  fi

FYI.. -type f is not required

I have no idea what the sort is for and IMHO the ksh command line with the foobar is a botch to lose a surplus parameter when the command line is too long.
You clearly did not write this script but it is hard to justify that this script works despite the absence of reported syntax or other error messages.

Sorry to be so abrupt but that ksh line is a real problem.



Are you really sure? I'm not so sure.

Did you try out before asking ? As I mentioned , it's working for years in PRODUCTION how can you blame the syntax.

Let's assume that $3 is a pre-existing writeable directory. We don't know anything about $2, but that could be the subject of the next post.
Couldn't post the entire script due to copyright. Don't need tutorial on positional parameters. Anyway this discussion didn't head out into right direction.

I bet you understand the problem but have no clue. You are not alone.
 

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