script to write PIDs to a file Post: 302572266

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Homework and Emergencies Homework & Coursework Questions script to write PIDs to a file Post 302572266 by navlelo on Wednesday 9th of November 2011 12:33:39 PM

11-09-2011

Registered User

script to write PIDs to a file

script to write PIDs to a file

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1. The problem statement, all variables and given/known data:

write a script that writes the PID of 2 different processes to a file every other time. as in pid a , pid b, pid a, pid b etc. then write a script that calculates the average runtime of 100 run throughs. (supposed to write a similar program in c that writes the PIDs aswell, to compare runtimes of the 2)
2. Relevant commands, code, scripts, algorithms:

bash
/usr/bin/time - built in gnu time thingy
octave - calculator for the time script

3. The attempts at a solution (include all code and scripts):

Code:

 
#!/bin/bash
function child{
        for X in {0..6}
do
                echo "$$"
                sleep 1
        done
        return 0;
}
function parent{
        for I in {0..6}
 do
                echo "$$"
                sleep 1
        done
        return 0;
}
#Start child function
child &
 
# Start start parent function
parent

this was supposed to get me the 2 PIDs, but not even that seems to work. will redirect them once I get them to return correctly
getting this error when I try to run it as executable

Code:

./pidbash.sh: line 8: return: can only `return' from a function or sourced script
./pidbash.sh: line 9: syntax error near unexpected token `}'
./pidbash.sh: line 9: `}'

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
Norwegian University of Science and Technology NTNU, Trondheim, Norway, Svein Erik Bratsberg, TDT4186 Operativsystemer, TDT4186 Operativsystemer
Note: Without school/professor/course information, you will be banned if you post here! You must complete the entire template (not just parts of it).

navlelo

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std::hash

std::hash< _Tp >(3cxx)													    std::hash< _Tp >(3cxx)

NAME

       std::hash< _Tp > -

SYNOPSIS

       Inherits std::__hash_base< _Result, _Arg >.

   Public Types
       typedef _Arg argument_type
       typedef _Result result_type

   Public Member Functions
       size_t operator() (_Tp __val) const
       template<> size_t operator() (bool __val) const
       template<> size_t operator() (char __val) const
       template<> size_t operator() (signed char __val) const
       template<> size_t operator() (unsigned char __val) const
       template<> size_t operator() (wchar_t __val) const
       template<> size_t operator() (char16_t __val) const
       template<> size_t operator() (char32_t __val) const
       template<> size_t operator() (short __val) const
       template<> size_t operator() (int __val) const
       template<> size_t operator() (long __val) const
       template<> size_t operator() (long long __val) const
       template<> size_t operator() (unsigned short __val) const
       template<> size_t operator() (unsigned int __val) const
       template<> size_t operator() (unsigned long __val) const
       template<> size_t operator() (unsigned long long __val) const
       template<> size_t operator() (float __val) const
       template<> size_t operator() (double __val) const
       template<> size_t operator() (long double __val) const

Detailed Description
   template<typename _Tp>struct std::hash< _Tp >
       Primary class template hash.

       Definition at line 58 of file functional_hash.h.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Nov 27 2012					    std::hash< _Tp >(3cxx)