| grouping | page | description |
| M_io::INTRO | M_io | Fortran I/O module (LICENSE:PD) |
| M_io:FILENAME | filename_generator | generate a filename containing a number (LICENSE:PD) |
| M_io:PATHNAMES | basename | return last component from filename (LICENSE:PD) |
| M_io:PATHNAMES | dirname | strip last component from filename (LICENSE:PD) |
| M_io:PATHNAMES | joinpath | join parts of a pathname together (LICENSE:PD) |
| M_io:PATHNAMES | splitpath | split a Unix pathname into components (LICENSE:PD) |
| M_io:QUERY | get_env | a function returning the value of an environment variable (LICENSE:PD) |
| M_io:QUERY | get_tmp | Return the name of the scratch directory (LICENSE:PD) |
| M_io:QUERY | getname | get name of the current executable (LICENSE:PD) |
| M_io:QUERY | is_hidden_file | determine if a pathname points to a hidden file, which is defined as a file basename starting with a period. (LICENSE:PD) |
| M_io:QUERY | notopen | Find a FUN/LUN (Fortran-unit-number) that is not in use (LICENSE:PD) |
| M_io:QUERY | number_of_lines | read an open sequential file to get number of lines (LICENSE:PD) |
| M_io:QUERY | print_inquire | Do INQUIRE on file by name/number and print results (LICENSE:PD) |
| M_io:QUERY | separator | try to determine pathname directory separator character (LICENSE:PD) |
| M_io:QUERY | uniq | append a number to the end of filename to make a unique name if name exists (LICENSE:PD) |
| M_io:READ | filebyte | read a file into a character array (LICENSE:PD) |
| M_io:READ | fileread | read a file into a string array (LICENSE:PD) |
| M_io:READ | get_next_char | read from a file one character at a time (LICENSE:PD) |
| M_io:READ | getline | read a line from specified LUN into allocatable string up to line length limit (LICENSE:PD) |
| M_io:READ | rd | ask for string from standard input with user-definable prompt (LICENSE:PD) |
| M_io:READ | read_line | read a line from specified LUN into allocatable string up to line length limit cleaning up input line (LICENSE:PD) |
| M_io:READ | read_table | read file containing a table of numeric values (LICENSE:PD) |
| M_io:SCANNAMES | lookfor | look for a filename in a number of directories specified by an environment variable (LICENSE:PD) |
| M_io:SCANNAMES | which | given a command name find the pathname by searching the directories in the environment variable $PATH (LICENSE:PD) |
| M_io:WRITE | filewrite | A simple write of a CHARACTER array to a file (LICENSE:PD) |
| M_io | fileclose | A simple close of a sequential file (LICENSE:PD) |
| M_io | filedelete | A simple close of an open file with STATUS='DELETE' (LICENSE:PD) |
| M_io | fileopen | A simple open of a sequential file (LICENSE:PD) |