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Full Discussion: Shell script runs fine in Solaris, in Linux hangs at wait command
Top Forums Shell Programming and Scripting Shell script runs fine in Solaris, in Linux hangs at wait command Post 302466867 by aksaravanan on Wednesday 27th of October 2010 02:34:43 PM
Old 10-27-2010
Shell script runs fine in Solaris, in Linux hangs at wait command
HI,

I have a strange problem. A shell script that runs fine on solaris. when i ported to linux, it started hanging.

here is the core of the script
Code:
CFG_FILE=tab25.cfg
sort -t "!" -k 2 ${CFG_FILE} | egrep -v "^#|^$" |  while IFS="!" read  a b c
do
#echo "jobs output"
#jobs
#echo "jobs -p  "
#jobs -p
# echo "Before entering parallel process  $$ "
#                jobs  -l
#if [[ `jobs | wc -l` -ne 0 ]] ; then
#               jobs|wc -l
#                ps -ef|grep "`jobs -p`"
#fi
 
wait
done

my CFG_FILE is
Code:
this_is_a_test_ttt! lask;djfl;a ljkasfl; as l;jsladfjasldfj aslk;fjas flj;asf fABCDEFGHIJ KLMNOP ABCDELKJ :LKJSDFLKJSDFKLJDFKDJF  DFKSDHFIUI JSF SIDFJISDFISJDIF  ! lkjasdflkjasf

repeated for 32 times.


if i uncomment the body of while loop , here is the output (that shows what for "wait" is waiting)
Code:
[2] +  Running                 <command unknown>
[1] -  Running                 <command unknown>
jobs -p  
28418

Before entering parallel process 28416
Code:
[2] + 28418      Running                 <command unknown>
       1 
myid   28418 28416  0 14:26 pts/31   00:00:00 egrep -v ^#|^$
myid   28421 28416  0 14:26 pts/31   00:00:00 ps -ef
myid   28422 28416  0 14:26 pts/31   00:00:00 grep 28421?28418

what causes this script wait for a while/grep command in linux whereas in solaris it is fine.

To give further details, i suppose to call a (8) background process, for each of line read from the file. So i introduced a wait command and when all complete i read next line and so on.
Since wait was really waiting for grep and not for spawned child, my script broke.

Othercases when it can run fine in linux

1. fewer lines in config file
2. in one test, i shrink one of row length from 260 to 250, it worked.

i can't predict a consitance condition for this behaviour.

Any help is appreciated in fixing / explaining this behaviour.

thanks
AK
Last edited by Scott; 10-27-2010 at 04:22 PM.. Reason: Please use code tags
 

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LEARN ABOUT OPENSOLARIS

atq

atq(1)								   User Commands							    atq(1)

NAME

       atq - display the jobs queued to run at specified times

SYNOPSIS

       atq [-c] [-n] [username]...

DESCRIPTION

       The  atq  utility  displays the at jobs queued up for the current user. at(1) is a utility that allows users to execute commands at a later
       date. If invoked by a user with the solaris.jobs.admin authorization, atq will display all jobs in the queue.

       If no options are given, the jobs are displayed in chronological order of execution.

       When an authorized user invokes atq without specifying username, the entire queue is displayed; when a username is  specified,  only  those
       jobs belonging to the named user are displayed.

OPTIONS

       The following options are supported:

       -c    Displays the queued jobs in the order they were created (that is, the time that the at command was given).

       -n    Displays only the total number of jobs currently in the queue.

FILES

       /var/spool/cron/atjobs	 spool area for at jobs.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       at(1), atrm(1), auths(1), cron(1M), auth_attr(4), attributes(5)

SunOS 5.11							    13 Aug 1999 							    atq(1)
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