Concanate argument strings and return result as a new string. Get value of environment variable str . Returns an empty string if variable var is undefined. Count the length of argument strings or lists. Report a non-recoverable error and exit with status 1 .
Function never returns.
Convert arguments to strings and print them to the output. Argument source can be string or list. Convert string string to a new regular expression. Modify regular expression character syntaxes by assigning new syntax syntax for character char . Returns the resulting string.