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Full Discussion: Script to clear filesystem
Operating Systems HP-UX Script to clear filesystem Post 302997273 by MadeInGermany on Wednesday 10th of May 2017 02:14:51 PM
Old 05-10-2017
Your script does not work for several reasons.
The du -x ... is run in the current directory.
root's home directory is / so it takes very long to traverse all the files. Then, the du output consists of numbers and directories. The for loop cycles through all of them. The code in the loop is run over and over again.
Now you know why it takes so long.
--
Once upon a time I created a script that rotates HP-UX system log files.
Useful on systems that are not regularly rebooted.
It is run by the crontab entry:
Code:
10 3 1 * * /usr/lib/newsyslog

And the executable /usr/lib/newsyslog looks like this
Code:
#!/bin/sh
# idea from Sun's newsyslog script
# HP-UX version
#
MIN_BLOCKS=2048 # rotate if >1MB
MAX_HIST=3 # .0 through .3
#
# access rotated files with
# last -f /var/adm/wtmp.0
# last -Xf /var/adm/wtmps.0
# lastb -f /var/adm/btmp.0
# lastb -Xf /var/adm/btmps.0
#
pgrepx(){
UNIX95=1 ps -C "$1" -o pid=
}
#
testlog(){
 for _i do
  [ -s "$_i" ] &&
   [ -n "`find "$_i" -prune -type f -size +"$MIN_BLOCKS"`" ] &&
   return
 done
}
#
rotatelog(){
 log=$1
 method=${2:-mv}
 i=$MAX_HIST
 while [ $i -gt 0 ]
 do
  j=`expr $i - 1`
  test -f $log.$j && mv $log.$j $log.$i
  i=$j
 done
 $method $log $log.0
 > $log
}
#
umask 22
LOGS="
/var/adm/syslog/syslog.log
/var/adm/syslog/mail.log
"
action=""
for log in $LOGS
do
 if testlog $log
 then
  rotatelog $log "mv"
  action=1
 fi
done
[ -n "$action" ] &&
 chmod 644 /etc/syslog.pid &&
 kill -HUP `cat /etc/syslog.pid`
#
LOGS="
/var/opt/omni/log/inet.log
/var/opt/omni/log/debug.log
"
action=""
for log in $LOGS
do
 if testlog $log
 then
  rotatelog $log "mv"
  action=1
 fi
done
#
umask 2
LOGS="
/var/adm/wtmps
/var/adm/wtmp
/var/adm/btmps
/var/adm/btmp
/var/adm/sulog
/var/adm/lp/lpd.log
"
# rotate all non-zero files or none
action=""
if testlog $LOGS
then
 for log in $LOGS
 do
  if [ -s $log ]
  then
   rotatelog $log "cp -p"
   action=1
  fi
 done
fi
#
# finally rotate the cron logs
umask 22
LOGS="
/var/adm/cron/log
"
action=""
cronstart=/sbin/init.d/cron
[ -f $cronstart ] && {
for log in $LOGS
do
 if testlog $log
 then
  rotatelog $log "mv"
  action=1
 fi
done
# restart cron a bit time-shifted
[ -n "$action" ] &&
 sleep 1 &&
 sh $cronstart stop &&
 sleep 1 &&
 sh $cronstart start
}
#

If you have understood it, you can add more things to the LOGS= strings.
Last edited by MadeInGermany; 05-10-2017 at 04:57 PM..
 

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LEARN ABOUT OSF1

log

log(8)							      System Manager's Manual							    log(8)

NAME

       log - Records input and output from a program

SYNOPSIS

       /usr/sbin/log <logfile> <command>

OPERANDS

       The file in which to record the interaction being logged.  The command to execute.

DESCRIPTION

       The  log  program  runs <command> and logs the input to and output from <command> to the <logfile> file.  Input and output are logged until
       <command> exits, the log program exits, and the exit status of <command> is returned.

       The log program is used by the system  installation  procedure  and  the  it(8)	command  to  create  the  /var/adm/smlogs/install.log  and
       /var/adm/smlogs/it.log installation log files.

RESTRICTIONS

       Because	the  log  program is used in the installation standalone environment, program size was the greatest concern in its implementation.
       The log program does not search for the PATH variable to locate <command> and error messages are terse.

       The log program causes <command> to take standard input from and write standard output and standard error to  UNIX  pipes.   Some  commands
       will  not  be able to operate in this environment; therefore, it is suggested that you use the script(1) command instead.  UNIX shells will
       not issue prompts when run from log unless the shell is started with an explicit interactive switch (-i for most shells).  For example, log
       foo.tmp /sbin/sh -i

       In the previous example, foo.tmp is the name of <logfile>.

       The  log  program  intercepts  end-of-file (usually Ctrl/d).  Therefore programs which normally receive end-of-file as an exit command must
       exit by some other means.

ERRORS

       Log open error

   Explanation:
       The log program was unable to open <logfile>. Verify that the directory exists and that ownerships and permissions are set correctly.

       Exec Error

   Explanation:
       The log program was unable to execute <command>. Verify that you specified a full pathname for <command> and  that  <command>  is  an  exe-
       cutable file.

       Fork Error

   Explanation:
       The log program was unable to create one of the processes it requires to log data.

SEE ALSO

       Commands: it(8), script(1)

																	    log(8)
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