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Perl Function "angle brackets"

Returns a line of data from the file. When reading anything in, (file, console, etc...) it is automatically split in to parts delimited by the $/ value. Note that it will ONLY RETURN ONE LINE (up to a linefeed) even if the file is in binmode if $/ is not set to something other than its default value of a linefeed. undef $/ to read the entire file in one shot with no splitting. Set $/ to an ordinal number to read a specific number of charicters each time (fixed record size)
It would appear that things like <*.txt> act as though they are opening and reading the directory listing as though it was a file using something called (I'm not making this up!) glob()

See also:


reading an entire binary file (line by line) without loosing the "linefeeds" in the binary data into a variable so you can tweek it before writing it back out.
$old = $file;
$new = "$file.bak";
$bak = "$file.orig";
open(OLD, "< $old")         or die "can't open $old: $!";
binmode OLD;
open(NEW, "> $new")         or die "can't open $new: $!";
binmode NEW;
$mydata = "";
while (<OLD>) {
  $mydata .= $_;
#now you can do stuff to $mydata;
#be sure to use s on the end of any regexps so that it will work across "lines"
#and use g on the end to replace all occurances
#e.g. s/old text/new text/sg
(print NEW $mydata)          or die "can't write to $new: $!";
rename($old, $bak)
rename($new, $old)

errr... no. no. no. see perlfaq6.html i'm having trouble matching over more than one line. what's wrong which basically says that if you put in

undef $/;

you will read in the entire thing in one shot rather than line by line and binmode shouldn't matter then. Also, you can set $/ to an ORDINAL number and it will read only that number of bytes.


file: /Techref/language/perl/anglebrackets.htm, 3KB, , updated: 2014/4/1 17:08, local time: 2024/7/20 08:28,

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