Find one liners

# Find a file and delete it. Replace foo.bar with the file or use wild cards *.bar
$ find /home -name foo.bar -type f -exec rm -f "{}" ';'

# When trying to find large files in / filesytem
# the find command will return results from
# other files systems. Try using the -dev option.
$ find / -dev -size +3000 -exec ls -l {} ; 

# This will not return files in /usr/local file system.
# This will return files large then 3000 blocks 
# only in the root file system.
$ find /usr -dev -size +5000 -exec ls -l {} ;

# Someone's done a 'cp -r' and filled up
# the filesystem. Here's a simple way to locate the unwanted files...
$ find . -ctime -1 -print

# Find has a partiularly powerful mechanism, -exec,
# which lets you execute commands on a per-file 
# basis, while being selective about the files you're operating on.
# Lets say we want to delete all the *.bak or *.backup 
# files which are older than 30 days.
# Type the following all on 1 line.
$ find . ( -name '*.bak' -o -name *.backup ) -type f -atime +30 -exec rm '{}' ;

# It would be even better if we only deleted 
# the *.bak file if the original file was still 
# available. In this case, we can use csh and test to help
# Type the following all on 1 line. 
$ find . ( -name '*.bak' -o -name *.backup ) -type f -atime +30 -exec csh -c 'if ( -f $1:r ) rm $1' '{}' ;

# or if you're really paraniod, use 'test -s' 
# to verify that the original file has not been truncated
# Type the following all on 1 line. 
$ find . -name '*.bak' -type f -atime +30 -exec csh -c 'test -s $1:r && rm $1' '{}' ;

# Protecting users from themselves - file permissions
$ find . -type l -exec gawk 'BEGIN { "ls -lag}' /dev/null ;

# Find text in whole directory tree:
$ find . -type f | xargs grep "text"

# Find and Replace in whole directory tree:
$ find . -type f [-name "..."] -exec perl -pi -e 's|xxx|yyy|g' {} ;

for example:
find . -type f -name "*html" -exec 
perl -pi -e 's|pibeta.psi.ch/~stefan|midas.psi.ch/~stefan|g' {} ;

# Show sorted file size of subtree
$ du -a . | sort -r -n | less