Locating Files:
The find
command is used to locate files on a Unix or Linux system. find
will search any set of directories you specify for files that match the supplied search criteria. You can search for files by name, owner, group, type, permissions, date, and other criteria. The search is recursive in that it will search all subdirectories too. The syntax looks like this:[]
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find where-to-look criteria what-to-do
All arguments to find
are optional, and there are defaults for all parts. (This may depend on which version of find
is used. Here we discuss the freely available GNU version of find
, which is the version available on YborStudent
.) For example where-to-look
defaults to .
(that is, the current working directory), criteria
defaults to none (that is, show all files), and what-to-do
(known as the find
action) defaults to -print
(that is, display the names of found files to standard output). Technically the criteria and actions are all known as find
primaries.
For example:
find
will display the pathnames of all files in the current directory and all subdirectories. The commands
find . -print find -print find .
do the exact same thing. Here’s an example find
command using a search criterion and the default action:
find / -name foo
This will search the whole system for any files named foo
and display their pathnames. Here we are using the criterion -name
with the argument foo
to tell find
to perform a name search for the filename foo
. The output might look like this:
/home/wpollock/foo /home/ua02/foo /tmp/foo
If find
doesn’t locate any matching files, it produces no output.
The above example said to search the whole system, by specifying the root directory (
) to search. If you don’t run this command as root, /
find
will display a error message for each directory on which you don’t have read permission. This can be a lot of messages, and the matching files that are found may scroll right off your screen. A good way to deal with this problem is to redirect the error messages so you don’t have to see them at all:
find / -name foo 2>/dev/null
You can specify as many places to search as you wish:
find /tmp /var/tmp . $HOME -name foo
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