Searching for files using find

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  - File Manipulation
    - Searching for files using find

When you work with many files, it can sometimes be difficult to remember where you have placed a file in the directory tree. The find command enables you to search through a directory and its subdirectories for files which meet a certain criteria. The command is flexible, in that it allows you to search by filename, owner, protection, size, date, or any combination. For example:

% find / -name myfile -print

The '/' is the name of the directory in which the command is to start searching, i.e. the root directory in this example. The '-name' option tells find the name of the file it is searching for. The '-print' option then echos to stdout the full path name of the file or files as they are found. You can include wildcards in your expression to describe a file name which contains certain characters. For example:

% find . -name 'my*' -print

The '.' specifies that the search should start from the current directory and proceed through any subdirectories. The 'my*' will find all files beginning with 'my', the expression has to be placed in single quotes so that the shell will interpret it correctly.

Here are some examples:

% find /home/john -newer myfile -print

Find in the directory /home/john and its subdirectories any files that have been modified more recently that the file 'myfile' and echo to stdout.

% find / -user john -print

Find all the files in the system belonging to the user 'john'.

% find . -name core -print -exec rm {} \;

Find all the files named core in the current directory and subdirectories. Ever time a find is found, the command following the '-exec' is executed, in this case rm. Where the braces {} appear in the command they are replaced by the name of the file. The backslash-semicolon '\;' is required by find to terminate the -exec option.

Common options for the find command are:

-name : search for a file.
-type : search for a file type, for example f for file, d for directory.
-user : search for files owned by a particular user.
-group : search for files owned by a particular group.
-size : search for files of a particular size given (given in 512-byte blocks).
-atime : search for files which have or have not been accessed in a particular number of days.
-mtime : search for files which have or have not been modified in a specified number of days.
-newer : find if any files have been modified more recently than the specified file.
-exec : execute a Unix command, replaces any {} for the file names found.
-ok : same as -exec except display the command to the terminal and execute the command only if the user types in Y.
-print : displays the full path name of files found.

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