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Top Forums UNIX for Dummies Questions & Answers Login PID in sh/bash different Post 302889645 by asd78in on Saturday 22nd of February 2014 03:16:05 PM
Old 02-22-2014
Login PID in sh/bash different

In bourne shell the PID generated for the command "ps" matches my login id PID in the command "who -Hu" but in bash/linux the PID generated with the same commands are different . Why so?
 

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rwsnoop(1m)							   USER COMMANDS						       rwsnoop(1m)

NAME
rwsnoop - snoop read/write events. Uses DTrace. SYNOPSIS
rwsnoop [-jPtvZ] [-n name] [-p PID] DESCRIPTION
This is measuring reads and writes at the application level. This matches the syscalls read, write, pread and pwrite. Since this uses DTrace, only users with root privileges can run this command. OPTIONS
-j print project ID -P print parent process ID -t print timestamp, us -v print time, string -Z print zone ID -n name process name to track -p PID PID to track EXAMPLES
Default output, # rwsnoop Print zone ID, # rwsnoop -.Monitor processes named "bash", # rwsnoop -n bash FIELDS
TIME timestamp, us TIMESTR time, string ZONE zone ID PROJ project ID UID user ID PID process ID PPID parent process ID CMD command name for the process D direction, Read or Write BYTES total bytes during sample FILE filename, if file based. Reads and writes that are not file based, for example with sockets, will print "<unknown>" as the file- name. DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver- bose descriptions explaining the output. EXIT
rwsnoop will run forever until Ctrl-C is hit. AUTHOR
Brendan Gregg [Sydney, Australia] SEE ALSO
rwtop(1M), dtrace(1M) version 0.70 Jul 24, 2005 rwsnoop(1m)
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