Use find when the answer must reflect the filesystem right now, or when you need filters such as file type, size, age, ownership, or permissions. Use locate when you need a fast name-based lead from an index. That index is refreshed by updatedb, so it can omit files created recently and retain paths that no longer exist. A dependable workflow is to use locate for a quick candidate path, then verify it with find before relying on the result or changing anything.
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What find, locate, and updatedb actually do
These commands answer similar-looking questions in different ways. GNU describes find as a program that searches a directory tree for a file or group of files. It walks the starting paths during your command and evaluates an expression against each directory entry. The result reflects what the filesystem contains at search time, subject to the permissions of the account running the command.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11locate does not normally walk the directory tree for each query. It searches one or more prebuilt filename databases. A database is much quicker for a simple name lookup, but its contents depend on when it was last generated, which directories the update configuration includes, and which paths are deliberately excluded.
updatedb creates or refreshes the database used by the installed locate implementation. On many systems it runs from a scheduled job; on others an administrator runs it manually. Running updatedb changes what later locate queries can see, not what the live filesystem contains.
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| Question | Start with | Why |
|---|---|---|
| Was this file created moments ago? | find |
It examines the current directory tree instead of waiting for an index refresh. |
| Do I need a size, type, age, ownership, or permission test? | find |
Its expression language supports metadata predicates and compound conditions. |
| Do I remember only part of a filename? | locate |
It can return indexed paths quickly using filename patterns. |
| Can I accept results that might be stale? | locate |
Its output is limited to the scope and timestamp of the filename database. |
| Am I about to modify or delete matching files? | find |
A live traversal lets you verify current existence and apply precise predicates before an action. |
The command named locate may be provided by GNU locate, mlocate, or plocate, depending on the distribution. They share the indexed-search concept, but options, quoting details, database formats, and defaults can differ. Check the local manual with man locate when a command behaves differently from the examples below.
Learn the find command syntax
The general form is:
find [starting-point...] [expression]Everything before the expression is a starting path. Everything after it is tested, printed, or acted upon for each entry below those paths. If you omit a starting path in a script or shell alias, you can accidentally search an unintended location, so make the path explicit.
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find . -name 'report.pdf'This searches below the current directory (.) for entries whose name matches report.pdf. A leading slash searches from the filesystem root, while a home directory or project path narrows the work:
find /home/alex/Documents -name 'report.pdf'
find /var/log -name '*.log'Quote wildcard patterns. Without quotes, the shell may expand *.log against names in your current directory before find receives the expression. The quoted form passes the pattern unchanged so find applies it at every level of the search.
Match without regard to capitalization
find /home -iname '*.jpg'-iname performs a case-insensitive name match, so extensions such as .jpg, .JPG, and mixed-case variants can match. Use -name when capitalization is meaningful.
Restrict matches by object type
find /var/log -type f -name '*.log'
find /tmp -type d -name 'cache*'-type f limits results to regular files; -type d limits them to directories. Filtering the type before a broad name pattern prevents a directory or another filesystem object from appearing in a result intended for files.
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find /data -type f -size +100M
find /var/log -type f -mtime -1The first command selects regular files larger than 100 MiB units as interpreted by GNU find‘s size syntax. The second selects regular files whose modification time is within the previous day-count period. These tests are evaluated against current metadata, so they are useful for finding large files or recently changed logs without first knowing their names.
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For a reproducible boundary, use the more specific time predicates available in your implementation, such as minute-based tests, and read man find for the exact rounding rules. Do not infer that “one day” means exactly 24 hours in every form of the command: day-based predicates count complete 24-hour periods according to find‘s documented behavior.
Combine conditions deliberately
find evaluates expressions from left to right, with operator precedence. A mixed expression using -o (OR) and the implicit or explicit -a (AND) can therefore match more entries than intended. Group alternatives with escaped or quoted parentheses:
find /srv -type f ( -name '*.log' -o -name '*.out' ) -size +10M -printHere, the type test applies to both filename alternatives, and the size test applies after the grouped name expression. The backslashes keep the shell from treating the parentheses as shell syntax. You can also quote the parentheses, for example '(' and ')', when that is clearer in a script.
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find /etc /usr/local/etc -type f -name '*.conf'Each starting point is traversed. This is often clearer and safer than searching from / when you already know the likely locations. A root-level search can cross many directories, mounted filesystems, and permission boundaries, producing a long run and diagnostic messages.
Useful find recipes
Find an exact filename below the current directory
find . -name 'report.pdf'Use this when the file was created recently or when index freshness matters. It reports the path as it exists during the traversal.
Find files of a particular extension anywhere in a tree
find /projects -type f -iname '*.jpg' -printThe explicit -print makes the output action visible in scripts and in explanations. It is also a useful preview before adding an action that changes files.
List recently modified log files
find /var/log -type f -name '*.log' -mtime -1 -printThis combines a path, object type, name pattern, and modification-age predicate. If the command produces permission diagnostics, keep the search rooted in directories your account can read or address the permissions separately rather than hiding errors automatically.
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Preview matches before an operation
Do not begin with a destructive action. First run the complete expression with -print and inspect every path:
find /tmp -type f -name '*.tmp' -printOnly after confirming the scope and pattern should you choose an action. For example, GNU find can remove matches with -delete:
find /tmp -type f -name '*.tmp' -deleteTreat that command as irreversible. Recheck the starting path, the type test, and the quoted pattern; never replace a specific path with / or a broad wildcard casually. If you need a program to process each result, -exec supplies the path as an argument:
find /data -type f -name '*.csv' -exec gzip -- '{}' ;Review the manual for your implementation before using an action in production, and test on a small directory first. An action is evaluated for every match, so an imprecise expression can affect many files.
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Handle spaces and newlines in filenames
Plain line-oriented output is easy to read but is not a safe interchange format for arbitrary filenames. When handing results to another command, use null-delimited output and a null-aware consumer:
find /data -type f -name '*.csv' -print0 | xargs -0 -r gzip --This prevents spaces, tabs, and embedded newlines in a filename from being split into separate arguments. Keep the same preview-first discipline when the downstream command changes or removes data.
Use locate for fast indexed name searches
The general form is:
locate [option...] pattern...A simple query searches the filename database for matching paths:
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locate 'report.pdf'Patterns can include shell-style wildcards. GNU documentation gives this capitalization alternative:
locate '*[Mm]akefile'Quote the pattern so your interactive shell does not expand it before locate interprets it. Depending on the implementation, -b can restrict matching to the basename rather than any part of the full path:
locate -b 'report.pdf'Because option support varies, verify -b with locate --help or the local manual. A basename query is useful when you want files named exactly report.pdf regardless of their parent directories; an unqualified pattern may also match a directory component containing that text.
Understand what the index contains
locate reads one or more databases generated by updatedb. The database scope is configuration-dependent: some directories may be included, while temporary, virtual, network, or administrator-excluded paths may be omitted. The refresh interval is also system-dependent.
A file created after the last update is not guaranteed to appear. Conversely, a path that was deleted or renamed after the update can remain in the results until the database is refreshed. A blank result therefore does not prove that the file is absent, and a printed path does not prove that it still exists.
When you administer the machine and need the index refreshed, run the system’s updatedb command according to its configuration and privilege requirements. On a shared system, changing update settings can affect every user and may require administrator access. After the update completes, repeat the locate query; if the directory is excluded by policy, refreshing alone will not add it.
Choosing the right command
| Need | Recommended approach | Important qualification |
|---|---|---|
| Find a file created seconds ago | find /likely/path -name 'name' |
Searches live directory entries; permissions and traversal time still apply. |
| Search by size, type, age, ownership, or permissions | find with predicates |
Build and preview the full expression before using an action. |
| Get a quick lead from a partial name | locate 'pattern' |
Only indexed paths are searched, and the index may be stale. |
| Confirm a path before opening, copying, or deleting | Run a matching find query |
The live check avoids trusting an old database entry. |
| Search a huge tree repeatedly for names | Use locate for discovery, then find for validation |
The best choice depends on index coverage and how current the result must be. |
A dependable locate-then-find workflow
- Search broadly by name. Run a quoted
locatepattern, such aslocate '*invoice*', to obtain candidate paths quickly. - Inspect the candidates. Remove results that clearly belong to an old location, an excluded context, or an unexpected directory.
- Verify live existence. Use
findon the relevant parent path with the exact name and any required type test, for examplefind /home/alex -type f -name 'invoice-2026.pdf'. - Add metadata requirements. Include size, age, ownership, or permission predicates if the operation depends on them.
- Preview the final result. Print every path and check the starting point, pattern, and output before invoking
-exec,-delete, or another modifying command.
This division of labor keeps the fast part of discovery separate from the correctness check. It also works when the index is intentionally incomplete: find remains the authoritative choice for the directories you can traverse.
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Troubleshoot common failures
“locate finds nothing, but the file exists.”
- The file may have been created since the last
updatedbrun. - Its directory may be excluded from the database configuration.
- Your pattern may not match the stored path or capitalization.
- The installed implementation may use a different database or option behavior.
Check the path with a targeted find command. If you administer the host, refresh the database and check its configured scope.
“locate prints a path that is gone.”
The index can contain a deleted or renamed path until the next successful update. Confirm it with find or another live filesystem check before opening or modifying it.
“find says permission denied.”
The account running the command cannot read or traverse part of the starting tree. Narrow the starting path to directories you are allowed to inspect, or run the command with the appropriate administrative authorization when policy permits. Suppressing diagnostics can hide directories that were never searched, so do not treat a quiet output as proof of completeness.
“My wildcard matches the wrong things.”
Quote the pattern: use find . -name '*.log', not find . -name *.log. The unquoted form is expanded by the shell in the current directory before find evaluates it.
“An OR expression returns unexpected paths.”
Group alternatives explicitly and include the type or other tests in the intended scope:
find /var -type f ( -name '*.log' -o -name '*.out' ) -mtime -7 -printParentheses prevent shell interpretation and make the expression’s precedence clear to both the shell and the reader.
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Reduce the starting tree first: search /home or a project directory instead of / when that is sufficient. Add a type or name predicate that eliminates irrelevant entries, and avoid traversing mounted or permission-heavy trees unless they are part of the question. For a repeated, name-only lookup where indexed coverage is acceptable, use locate and reserve find for confirmation.
Command reference
| Goal | Command |
|---|---|
| Exact name below the current directory | find . -name 'report.pdf' |
| Case-insensitive image search | find /home -iname '*.jpg' |
| Regular log files | find /var/log -type f -name '*.log' |
| Directories beginning with “cache” | find /tmp -type d -name 'cache*' |
| Regular files larger than 100M | find /data -type f -size +100M |
| Files modified within the recent day-count period | find /var/log -type f -mtime -1 |
| Indexed filename search | locate 'report.pdf' |
| Indexed Makefile search, either capitalization | locate '*[Mm]akefile' |
| Basename match where supported | locate -b 'report.pdf' |
| Refresh the locate database | updatedb |
The essential distinction is simple: find computes an answer from the live trees you specify, while locate retrieves names from a periodically refreshed index. Choose the former for freshness and expressive conditions, the latter for speed and quick name discovery, and combine them when you need both.
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