![]() ![]() ![]() For instance, in this little bit of code, you want to print a dot to the screen for every line you process to watch the progress of your program. By saving up output, it makes fewer expensive system calls. Perl normally buffers output so it doesn't make a system call for every bit of output. You might like to read Mark Jason Dominus's "Suffering From Buffering" at. # How do I flush/unbuffer an output filehandle? Why must I do this? This section deals with I/O and the "f" issues: filehandles, flushing, formats, and footers. Why do I get weird spaces when I print an array of lines?.How do I select a random line from a file?.Why does Perl let me delete read-only files? Why does -i clobber protected files? Isn't this a bug in Perl?.Why doesn't glob("*.*") get all the files?.Why can't I use "C:\temp\foo" in DOS paths? Why doesn't `C:\temp\foo.exe` work?.How do I close a file descriptor by number?.How can I tell whether there's a character waiting on a filehandle?.How can I read a single character from a file? From the keyboard?.How can I read in a file by paragraphs?.How can I read in an entire file all at once?.How do I print to more than one file at once?.How do I set a file's timestamp in perl?.How do I get a file's timestamp in perl?.How do I randomly update a binary file?.All I want to do is append a small amount of text to the end of a file.I just want to increment the number in the file. Why can't I just open(FH, ">file.lock")?.How can I open a file named with a leading ">" or trailing blanks?.Why do I sometimes get an "Argument list too long" when I use ?.How come when I open a file read-write it wipes it out?.How can I translate tildes (~) in a filename?.How can I output my numbers with commas added?.How can I set up a footer format to be used with write()?.How can I open a filehandle to a string?.How can I make a filehandle local to a subroutine? How do I pass filehandles between subroutines? How do I make an array of filehandles?.How can I manipulate fixed-record-length files?.How can I use Perl's -i option from within a program?.How do I delete the last N lines from a file?.How do I count the number of lines in a file?.How do I change, delete, or insert a line in a file, or append to the beginning of a file?.How do I flush/unbuffer an output filehandle? Why must I do this?. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |