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user@example $ grep `date '+%Y-%m-%d'` /var/log/exim_rejectlog | perl -lne 'print $1 if ( /\[(\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3})\]/ )' | sort -u | xargs -0 -I IP egrep IP /etc/hosts.deny

Accept command line arguments in a bash alias like in csh:

user@example $ alias apgg='theapg () { apg -m $1 -x $1 -a 0; apg -m $1 -x $1 -a 1; exit 0; }; theapg $1'

Feed a list of filenames that have spaces in them to a command using xargs. Here the files are of name "Excel 2009-04-08 04;34;44.zip" - actually needed this because else need to remove old backups by hand...

user@example $ ~/gymbackups $  ls | xargs -d '\n' -I FN echo "ls -al 'FN'" | sh
-rw-r--r-- 1 gregg gregg 225911982 Apr  8 05:19 Excel 2009-04-08 04;34;44.zip
-rw-r--r-- 1 gregg gregg 225939060 Apr  9 05:19 Excel 2009-04-09 04;34;36.zip
-rw-r--r-- 1 gregg gregg 225941296 Apr 10 05:19 Excel 2009-04-10 04;34;38.zip
-rw-r--r-- 1 gregg gregg 225945178 Apr 11 05:19 Excel 2009-04-11 04;34;46.zip

Find big files from where you are at, in megabytes (designated by "M")

alias big='BIG () { find . -size +$1M -ls; }; BIG $1'

Un-gzip and untar a lot of files at once..

for file in `ls *.tar.gz`; do gunzip $file; newfile=`echo $file | sed 's/\.gz//'`; tar -xvf $newfile; done