Common functions

Function	Description
`index(s,t)`	Position in string s where string t occurs, 0 if not found
`length(s)`	Length of string s (or $0 if no arg)
`rand`	Random number between 0 and 1
`substr(s,index,len)`	Return len-char substring of s that begins at index (counted from 1)
`srand`	Set seed for rand and return previous seed
`int(x)`	Truncate x to integer value
`split(s,a,fs)`	Split string s into array a split by fs, returning length of a
`match(s,r)`	Position in string s where regex r occurs, or 0 if not found
`sub(r,t,s)`	Substitute t for first occurrence of regex r in string s (or $0 if s not given)
`gsub(r,t,s)`	Substitute t for all occurrences of regex r in string s
`system(cmd)`	Execute cmd and return exit status
`tolower(s)`	String s to lowercase
`toupper(s)`	String s to uppercase
`getline`	Set $0 to next input record from current input file.

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