COMP 2400 Software Tools

Goals: 

• Understand Perl file handling
  • Opening a file for input
  • Opening a file for output
  • Opening a file for appending
  • Open a file and place # as the first character for all lines in that file
  • Special variable $_ for file processing
  • Control structures and looping (foreach, while, for)

Useful commands/tips:

• incrementing string variable $i = "000"; makes it equal to "001"
• Common pattern to loop through each line of file where the file handle is INFO ($_ refers to the current line):
  
  while (<INFO>)
  { 
    print $i++ . " $_";
  }

Useful Links:

• Perl Book

Online Tutorial:

• Perl introductory tutorial