Users and processes Post: 302076966

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Top Forums UNIX for Dummies Questions & Answers Users and processes Post 302076966 by vgersh99 on Saturday 17th of June 2006 11:49:44 AM

06-17-2006

Moderator

Assumint this output of 'ps -ef':

Code:

ps -ef:

UID PID PPID C STIME TTY TIME CMD
root 1 0 0 May26 ? 00:00:07 init
root 2 1 0 May26 ? 00:00:00 [keventd]
root 3 1 0 May26 ? 00:00:00 [kapmd]
root 4 1 0 May26 ? 00:00:00 [ksoftirqd_CPU0]
root 5 1 0 May26 ? 00:00:16 [kswapd]
root 6 1 0 May26 ? 00:00:00 [bdflush]
root 7 1 0 May26 ? 00:00:00 [kupdated]

# pipe the output of 'ps -ef' as the input to 'nawk ....' - 'Chiefos.awk' is the 'awk' script.

ps -ef | nawk -f Chiefos.awk

Chiefos.awk:

Code:

BEGIN {
  # save the default awk FieldSeparator by default FS is " " [simplified]
  FSorig=FS
  
  # reset the FieldSeparator to ":" - the field separator of '/etc/passwd'
  FS=":"
  passwd="/etc/passwd"

  # read the content of the '/etc/passwd' into awk associative array
  # indexed by the FIRST field of '/etc/passwd' [UID] with the value
  # of the FIFTH field [full user name]
  while (getline < passwd > 0 )
     arrPWD[$1] = $5

  # reset the FieldSeparator to its original value [" "]
  FS=FSorig
}

# save the the FIRST line of the input [ps -ef] as a 'header'.
FNR==1 { header=$0; next }

# for the 'other' lines build up the array ['arr'] indexed by the FIRST column 
# of the input [UID] with the content of the EVERY record/line of the input
# [ps -ef]. The lines with the same UID [first field - $1] are concatinated with
# 'SUBSEP' in between te strings.
{ arr[$1] = ($1 in arr) ? arr[$1] SUBSEP $0 : $0 }

# After ALL the input lines [from 'ps -ef'] are processed - print out
END {
   # iterate trough the array build based on the input ['ps -ef'] above
   # The iterator [i] is the FIRST field in 'ps -ef'
   for ( i in arr ) {

       # given the iterator [UID] - look it up in the array built based on the 
       # content of '/etc/passwd'.
       # This outputs the UserName and the Header line from 'ps -ef'
       printf("%s\n\t%s\n", arrPWD[i], header)

       # deconstruct the content of the arr[i] - it's a concatination of ALL
       # the lines ['ps -ef'] for a user [current itertator 'i']. The result is an
       # array 'procA' with 'n' entries.
       n=split(arr[i], procA, SUBSEP)

       # iterate through the procA array outputing all cells.
       for(y=1; y <= n ; y++)
          printf("\t%s\n", procA[y])
  }
}

Last edited by vgersh99; 06-17-2006 at 01:52 PM.. Reason: added comments

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LEARN ABOUT NETBSD

renice

RENICE(8)						    BSD System Manager's Manual 						 RENICE(8)

NAME

     renice -- alter priority of running processes

SYNOPSIS

     renice priority [[-p] pid ...] [-g pgrp ...] [-u user ...]
     renice -n increment [[-p] pid ...] [-g pgrp ...] [-u user ...]

DESCRIPTION

     renice alters the scheduling priority of one or more running processes.  The following who parameters are interpreted as process ID's,
     process group ID's, or user names.  renice'ing a process group causes all processes in the process group to have their scheduling priority
     altered.  renice'ing a user causes all processes owned by the user to have their scheduling priority altered.  By default, the processes to
     be affected are specified by their process ID's.

     Options supported by renice:

     -g      Force who parameters to be interpreted as process group ID's.

     -n      Instead of changing the specified processes to the given priority, interpret the following argument as an increment to be applied to
	     the current priority of each process.

     -u      Force the who parameters to be interpreted as user names.

     -p      Resets the who interpretation to be (the default) process ID's.

     For example,

	   renice +1 987 -u daemon root -p 32

     would change the priority of process ID's 987 and 32, and all processes owned by users daemon and root.

     Users other than the super-user may only alter the priority of processes they own, and can only monotonically increase their ``nice value''
     within the range 0 to PRIO_MAX (20).  (This prevents overriding administrative fiats.)  The super-user may alter the priority of any process
     and set the priority to any value in the range PRIO_MIN (-20) to PRIO_MAX.

     Useful priorities are: 0, the ``base'' scheduling priority; 20, the affected processes will run only when nothing at the base priority wants
     to; anything negative, the processes will receive a scheduling preference.

FILES

     /etc/passwd  to map user names to user ID's

SEE ALSO

     nice(1), getpriority(2), setpriority(2)

HISTORY

     The renice command appeared in 4.0BSD.

BUGS

     Non super-users can not increase scheduling priorities of their own processes, even if they were the ones that decreased the priorities in
     the first place.

BSD
								   June 9, 1993 							       BSD

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