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Full Discussion: script to check for existence of file (or else sleep for x time)
Top Forums Shell Programming and Scripting script to check for existence of file (or else sleep for x time) Post 302508067 by pchang on Friday 25th of March 2011 02:58:15 PM
Old 03-25-2011
script to check for existence of file (or else sleep for x time)
Hi Forum.

I have a script that accepts 3 input parameters (source directory, list file text, sleep time) and checks for the presence of files. If not there, script goes to sleep for certain amount of time provided by 3rd input.

list file text contains 1 entry but may contain more (file prefix):
MF_FF

Code:
#!/usr/bin/ksh

# Setup working variables
source_directory="$1"
src_list_files="$2"
sleep_time=$3
UPLD_DIR_BASE=/data/data2/staging

while read line
do
   source_file=`echo $line | awk '{print $1}'`
   while [[ ! -e ${UPLD_DIR_BASE}/${source_directory}/${source_file}*[0-9]*.[dD][
aA][tT]* ]]
   do
      echo "sleeping..."
      sleep ${sleep_time}
   done
 
done < ${UPLDSH_DIR}/${src_list_files}

Code:
Input:
$ pwd
/data/data2/staging/mf
$ ls MF*
MF_FF_20110228.dat

Output:
$ edw_check_source_files.sh mf MF_load_files.txt 55
sleeping...
sleeping...
.....

I cannot understand why my script is going to sleep even though the file exists.

Anyone can help me with my code and also ways to improve it?

Thanks Forum.
 

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LEARN ABOUT OPENSOLARIS

sleep

sleep(1)							   User Commands							  sleep(1)

NAME

       sleep - suspend execution for an interval

SYNOPSIS

   /usr/bin/sleep
       /usr/bin/sleep time

   ksh93
       sleep time

DESCRIPTION

   /usr/bin/sleep
       sleep suspends execution for at least the integral number of seconds specified by time.

   ksh93
       sleep suspends execution for at least the time in seconds specified by time or until a SIGALRM signal is received.

OPERANDS

   /usr/bin/sleep
       The following operands are supported for /usr/bin/sleep:

       time    time in seconds can be specified as a non-negative decimal integer number.

   ksh93
       The following operands are supported:

       time    Specify time in seconds as a floating point number. The actual granularity depends on the underlying system, normally around 1 mil-
	       lisecond.

EXAMPLES

       Example 1 Suspending Command Execution

       The following example executes a command after a certain amount of time:

	 example% (sleep 105; command)&

       Example 2 Executing a Command Every So Often

       The following example executes a command every so often:

	 example% while true
	 do
		 command
		 sleep 37
	 done

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE,  LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0     The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES).

       >0    An error has occurred.

ATTRIBUTES

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

   /usr/bin/sleep
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

   ksh93
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Uncommitted		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh93(1), wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5)

NOTES

       If the sleep utility receives a SIGALRM signal, one of the following actions is taken:

	   o	  Terminate normally with a zero exit status.

	   o	  Effectively ignore the signal.

       The sleep utility takes the standard action for all other signals.

SunOS 5.11							    20 Nov 2007 							  sleep(1)
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