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Full Discussion: Help with diff command
Top Forums UNIX for Dummies Questions & Answers Help with diff command Post 302895494 by John K on Tuesday 1st of April 2014 05:02:23 AM
Old 04-01-2014
Thank You Subbeh.

Two questions:
1. What is the role of less than character in red below ?

2. What is the role of double pipe operater ?

Code:
$ diff <(sort a.txt) <(sort b.txt) || echo 'there is a difference'
1a2
> NETHERLANDS

 

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LEARN ABOUT MOJAVE

syscallbyproc.d

syscallbyproc.d(1m)						   USER COMMANDS					       syscallbyproc.d(1m)

NAME

       syscallbyproc.d - syscalls by process name. Uses DTrace.

SYNOPSIS

       syscallbyproc.d

DESCRIPTION

       syscallbyproc.d is a DTrace OneLiner to a report of the number of system calls made by process name.

       This is useful to identify which process is causing the most system calls.

       Docs/oneliners.txt and Docs/Examples/oneliners_examples.txt in the DTraceToolkit contain this as a oneliner that can be cut-n-paste to run.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       This samples until Ctrl-C is hit.
	      # syscallbyproc.d

FIELDS

       first field
	      This  is the process name. There may be several PIDs that have the same process name, for example with numerous instances of "bash".
	      The value reported will be the sum of them all.

       second field
	      This is the count, the number of system calls made.

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

       syscallbyproc.d will sample until Ctrl-C is hit.

AUTHOR

       Brendan Gregg [Sydney, Australia]

SEE ALSO

       procsystime(1M), dtrace(1M), truss(1)

version 1.00							   May 15, 2005 					       syscallbyproc.d(1m)
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