Programming Perl, 4th Edition

Locating Code

Inside the debugger, you can extract and display parts of your program with these commands.

l

l LINE

l SUBNAME

l MIN+INCR

l MIN–MAX

The l command lists the next few lines of your program, or the specified LINE if provided, or the first few lines of the SUBNAME subroutine or code reference.

The l MIN+INCR form lists INCR+1 lines, starting at MIN. The l MIN–MAX form lists lines MIN through MAX.

–

This command lists the previous few lines of your program.

w [LINE]

Lists a window (a few lines) around the given source LINE, or the current line if no LINE is supplied.

f FILENAME

This command lets you view a different program or eval statement. If the FILENAME is not a full pathname as found in the values of %INC, it is interpreted as a regular expression to find the filename you mean.

/PATTERN/

This command searches forward in the program for PATTERN; the final / is optional. The entire PATTERN is optional, too; if omitted, it repeats the previous search.

?PATTERN?

This command searches backward for PATTERN; the final ? is optional. It repeats the previous search if PATTERN is omitted.

S

S PATTERN

S !PATTERN

The S command lists those subroutine names matching (or, with !, those not matching) PATTERN. If no PATTERN is provided, all subroutines are listed.