...at index i , of length n . If n is omitted, the suffix of s , starting at i is returned. tolower( s ) Returns a copy of s with all upper case characters converted to lower case.…pattern scanning and processing language NAME gawk - pattern scanning and processing language SYNOPSIS gawk [ POSIX or GNU style options ] -f program-file [ -- ] file ... gawk [ PO…pattern scanning and processing language NAME gawk - pattern scanning and processing language SYNOPSIS gawk [ POSIX or GNU style options ] -f program-file [ -- ] file ... gawk [ PO…pattern scanning and processing language NAME gawk - pattern scanning and processing language SYNOPSIS gawk [ POSIX or GNU style options ] -f program-file [ -- ] file ... gawk [ PO…