Move file position indicator to beginning of open file
Open the following file, perform a read operation, and then move the file position indicator back to the beginning of the file.
fopen to open the file, and then use
fgetl to read the first two lines.
fid = fopen('badpoem.txt'); tline1 = fgetl(fid) % read first line
tline1 = 'Oranges and lemons,'
tline2 = fgetl(fid) % read second line
tline2 = 'Pineapples and tea.'
The previous two read operations moved the position indicator to the beginning of line
3 in the poem. As a result, the next read operation using
fgetl returns line
tline3 = fgetl(fid)
tline3 = 'Orangutans and monkeys,'
To reread the first line of the file. Reset the position indicator using the
frewind function, and then perform the read operation.
ans = 'Oranges and lemons,'
Close the file.
If the file is on a tape device and the rewind operation fails,
frewind does not return an error message.
frewind(fileID) is equivalent to:
fseek(fileID, 0, 'bof');