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How to Finds File in linux

There are two invaluable commands that can be used to find files on the filesystem: locate and find. The locate command is the easier of the two to use. Just type the command followed by part or all of the filename you are searching for such as locate .odt to find all text files or locate compare to find all filenames that contain the word compare. Notice that no wildcard characters are used. It is assumed that what you type may only be part of the filename you are looking for.
The only catch to this command is that it relies on the generation of a database file so it can quickly display results. The locate command is provided by the mlocate package, which also provides the cron script /etc/cron.daily/mlocate.cron to
automatically generate this database daily. If you are looking for a file created that same day, it might not appear in the locate results if the database hasn’t been updated since the file was created.
The find command is a bit more complicated to use and takes longer to produce results because it does not rely on a database to produce results. Because it takes longer, it is possible to specify a specific directory to look in. The basic syntax is as follows:

find <directory> -name <filename>

Replace <directory> with the directory to start looking in. It will look recursively through the directory, meaning that it will look in any subdirectories, subdirectories of the subdirectories, and so on. Replace <filename> with the filename for which you are searching. To search in the current directory and below, replace <directory> with a dot (.) character such as:

find . -name guidelines.txt


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