linux - cronjob not working as intended -


this script arc_rem.sh(755 permission) added in crontab follows 

  00 0,3,6,9,12,15,18,21 * *         * . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null 2>&1

and script arc_rem.sh follows

  rm /biamd/arch01/usageprd/arch/old_arcs.log   cd /biamd/arch01/usageprd/arch   lga=`sqlplus -s tcs384160/tcs#1234 <<\eof   set pagesize 0 feedback off verify off heading off echo off   select max(sequence#) v$archived_log;   exit;   eof`   echo $lga;   u_limit=`expr $lga - 35`;   l_limit=`expr $u_limit - 1000`;   echo $l_limit;   echo $u_limit;   loop_var=$l_limit;   while [ $loop_var -le $u_limit ];      ls  /biamd/arch01/usageprd/arch/*_${loop_var}_*.arc   >> /biamd/arch01/usageprd/arch/old_arcs.log;   loop_var=`expr $loop_var + 1`;   done;   rm `cat /biamd/arch01/usageprd/arch/old_arcs.log`

i have included absolute path wherever could.

this requirement of script delete files older sequence(u_limit in above script) ,it populating old_arcs.log , doing rm on file(last line of code)

following issues noticed

1)whenever cronjob executes @ interval of 3hrs daily size of old_arcs 0 ,hence no files removed rm ,but script works fine when execute manually sh arcs_rem.sh populates old_arcs.log intended , deletes files.

2) when ps -ef|grep sh during cronjob execution time o/p follows looks many instances of same shell script running,dont know reason why , consumes more cpu

  oracle   473   455   1 21:00:00 ?         335:37 sh -  c . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null 2>&1   oracle   614   485   1 15:00:01 ?          30:01 sh -c . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null 2>&1   oracle  8278  8240   1 03:00:01 ?         150:37 sh -c . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null 2>&1   oracle 18331 18171   1 18:00:01 ?           2:36 sh -c . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null   oracle  1845  4464   0 06:00:01 ?           0:00 sh -c . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null 2>&1   oracle  9887  9822   1 00:00:01 ?         189:59 sh -c . ./.cronprofile;/biamd/arch01/usageprd/arch/arch_rem.sh >/dev/null 2>&1

it helpful if tell me wrong script or crontab config , workaround

edit:

i have checked loop variables , getting updated fine,what reason infinite loops

  1. you should not use relative paths ./.cronprofile in cron job commands.
  2. from ps output looks cron jobs running indefinitely, or @ least long. should check infinite loop. cron not care whether script running when starting one. print $loop_var , $u_limit inside loop verify they're changing expected.
  3. use more quotes™.
  4. don't parse ls output.
  5. shell script commands not have terminated ;.
  6. you should use $() rather ``.
  7. add set -o errexit -o noclobber -o nounset @ top of script enable basic error handling. should work in posix shell.

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