Built-in Functions in awk - English

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Linux AWK Tutorials - English

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Outline:
awk Built-in functions:
Arithmetic functions
    sqrt(x) function
    int(x) function
    exp(x) function
    log(x) natural logarithm function
    sin(x) and cos(x) functions
Random functions.
    rand() 
    srand()
String functions
    length() function
    index() function
    substr() function
Input/Output functions and
    system() function
Timestamp functions
   system("date")