I use cloc (cloc.sf.net) in a bash script I call 'apparently_unused' 

#!/bin/bash

cloc --strip-comments=nc $1 > /dev/null 2>&1

if [ -e "$1.nc" ]
then
    subs=`grep -E "^sub " $1.nc | cut -d' ' -f2 | sort -u`
    res=();
    for sub in ${subs}
    do
        grep ${sub} $1.nc | grep -vq "sub ${sub}"
        if [ "$?" == "1" ]
        then
            res=("${res[@]}" "${sub}")
        fi
    done
    if [ ${#res[@]} == 0 ]
    then
        echo All subroutines in $1 appear to be used
    else
        echo $1 apparently unused:
        for sub in ${res[@]}
        do
            echo "  $sub"
        done
    fi
    rm $1.nc
else
    echo "failed to strip comments from $1"
fi

[download]

This is only 'apparently' unused subroutines because of calls that can be made in the way others have pointed out that this simple grep will miss. The cloc program cleans up a lot of false negatives by removing comments that may include subroutine names. Also, this assumes you have 'sub' lines that start at the first column - use perltidy.

In reply to Re: Cleaning up unused subroutines by kelpless
in thread Cleaning up unused subroutines by koknat

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.