How To Read From A Pipeline With Perl

  • 23 Dec, 2011

    Example 1: To run the date command from a Perl program, and read the outputof the command, all you need are a few lines of code like this: open(DATE, "date|"); $theDate = <DATE>; close(DATE); The open() function runs the external date command, then opens a file handle DATE to the output of the date command. Next, the output of the date command is read into the variable $theDate through the file handle DATE. Example 2:The following code runs the "ps -f" command, and reads the output: open(PS_F, "ps -f|"); while (<PS_F>) { ($uid,$pid,$ppid,$restOfLine) = split; # do whatever I want with the variables here ... } close(PS_F);

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