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C Program to Save output of system command to variable with popen

How to write a C Program to Save output of system command to variable with popen ?

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C# Programming

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Queue - Linked Lists
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C++ Programming

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Queue - Linked Lists
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C Programming

Intro
If Statements
Loops
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Switch case
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Structures
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Strings
File I/O
Typecasting
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Queue - Linked Lists
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Perl Programming

Intro
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Strings
File I/O
Typecasting
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Queue - Linked Lists
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C# Programming

Intro
If Statements
Loops
Functions
Switch case
Pointers
Structures
Arrays
Strings
File I/O
Typecasting
Command Line Arguments
Linked Lists
Queue - Linked Lists
Recursion
Variable Arg Lists
Binary Trees

Java Programming

Intro
If Statements
Loops
Functions
Switch case
Pointers
Structures
Arrays
Strings
File I/O
Typecasting
Command Line Arguments
Linked Lists
Queue - Linked Lists
Recursion
Variable Arg Lists
Binary Trees

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