| tuple_environment | Read one or more environment variables. |
| tuple_split | Split strings into substrings between predefined separator symbol(s). |
| tuple_str_first_n | Cut the first characters up to position ``n'' out of string tuple. |
| tuple_str_last_n | Cut all characters starting at position ``n'' out of string tuple. |
| tuple_strchr | Forward search for a character within a string tuple. |
| tuple_strlen | Length of every string within a tuple of strings. |
| tuple_strrchr | Backward search for a character within a string tuple. |
| tuple_strrstr | Backward search for string(s) within a string tuple. |
| tuple_strstr | Forward search for string(s) within a string tuple. |