# phpman > man > B::Showlex

## NAME
    [B::Showlex](https://www.chedong.com/phpMan.php/perldoc/B%3A%3AShowlex/markdown) - Show lexical variables used in functions or files

## SYNOPSIS
            perl -MO=Showlex[,-OPTIONS][,SUBROUTINE] foo.pl

## DESCRIPTION
    When a comma-separated list of subroutine names is given as options, Showlex prints the lexical
    variables used in those subroutines. Otherwise, it prints the file-scope lexicals in the file.

## EXAMPLES
    Traditional form:

     $ perl -MO=Showlex -e 'my ($i,$j,$k)=(1,"foo")'
     Pad of lexical names for comppadlist has 4 entries
     0: (0x8caea4) undef
     1: (0x9db0fb0) $i
     2: (0x9db0f38) $j
     3: (0x9db0f50) $k
     Pad of lexical values for comppadlist has 5 entries
     0: SPECIAL #1 &PL_sv_undef
     1: NULL (0x9da4234)
     2: NULL (0x9db0f2c)
     3: NULL (0x9db0f44)
     4: NULL (0x9da4264)
     -e syntax OK

    New-style form:

     $ perl -MO=Showlex,-newlex -e 'my ($i,$j,$k)=(1,"foo")'
     main Pad has 4 entries
     0: (0x8caea4) undef
     1: (0xa0c4fb8) "$i" = NULL (0xa0b8234)
     2: (0xa0c4f40) "$j" = NULL (0xa0c4f34)
     3: (0xa0c4f58) "$k" = NULL (0xa0c4f4c)
     -e syntax OK

    New form, no specials, outside O framework:

     $ perl -[MB::Showlex](https://www.chedong.com/phpMan.php/perldoc/MB%3A%3AShowlex/markdown) -e \
        'my ($i,$j,$k)=(1,"foo"); [B::Showlex::compile](https://www.chedong.com/phpMan.php/perldoc/B%3A%3AShowlex%3A%3Acompile/markdown)(-newlex,-nosp)->()'
     main Pad has 4 entries
     1: (0x998ffb0) "$i" = IV (0x9983234) 1
     2: (0x998ff68) "$j" = PV (0x998ff5c) "foo"
     3: (0x998ff80) "$k" = NULL (0x998ff74)

    Note that this example shows the values of the lexicals, whereas the other examples did not (as
    they're compile-time only).

  OPTIONS
    The "-newlex" option produces a more readable "name => value" format, and is shown in the second
    example above.

    The "-nosp" option eliminates reporting of SPECIALs, such as "0: SPECIAL #1 &PL_sv_undef" above.
    Reporting of SPECIALs can sometimes overwhelm your declared lexicals.

## SEE ALSO
    [B::Showlex](https://www.chedong.com/phpMan.php/perldoc/B%3A%3AShowlex/markdown) can also be used outside of the O framework, as in the third example. See [B::Concise](https://www.chedong.com/phpMan.php/perldoc/B%3A%3AConcise/markdown)
    for a fuller explanation of reasons.

## TODO
    Some of the reported info, such as hex addresses, is not particularly valuable. Other
    information would be more useful for the typical programmer, such as line-numbers, pad-slot
    reuses, etc.. Given this, -newlex is not a particularly good flag-name.

## AUTHOR
    Malcolm Beattie, "<mbeattie@sable.ox.ac.uk>"