These are some unix shell (bash/ksh/tcsh/...) tricks I've collected. I'm placing them here because, typically I'm away from my personal machine when I most need one.

    function fps {
        (( $# )) &&
        ps -aux | sed -n "1p;/_µµµµ_µµµµ_fps_µµµµ_µµµµ_/d;/$1/p" ||
        echo "Usage: fps <search string>"
    }

Interesting button on an order form I saw: It deals with the issue of multiple clicks on a submission button by changing the name when the user first clicks on the button and ignoring additional clicks.

<script type='text/javascript'>

document.write("<INPUT TYPE='button' NAME='Submit'
   VALUE='Submit Secure Order' onClick=\"if(this.value ==
   'Submit Secure Order') this.form.submit();
   this.value = 'Working...Please Wait.';\">");
// -->
</script>
<noscript>
<INPUT TYPE='submit' NAME='Submit' VALUE='Submit Secure Order'>
</noscript>

List All Available Man Pages:

man --path | perl -pe 's/:/\n/g' | xargs -J% -n1 find % -type f | xargs basename | sort -u

Dos2Unix Line Ending Conversion:

perl -pi -e 's/\r\n/\n/;' filename ...

Subtract Files: Output all lines in FileA not also in FileB

sort FileA | uniq | sort - FileB FileB | uniq -u

If you know that FileA contains unique lines only, then this simplifies to:

sort FileA FileB FileB | uniq -u

perl -e '@T=localtime(time-86400);printf("%2d/%2d/%4d\n",$T[4]+1,$T[3],$T[5]+1900)'
perl -e 'use POSIX;print POSIX::strftime("%m/$d/%Y\n",localtime(time-86400))'

cal | awk '{print $2,$3,$4,$5,$6}' | tr -s '[:blank:]' '\n' | tail -1