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updatedb-更新文件数据库.md

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The updatedb command

The updatedb command creates or updates the database used by the locate command. If the database already exists, updatedb reuses its data to avoid rereading unchanged directories. Typically, updatedb is run by cron every day to update the default database.

Syntax

updatedb [OPTION]...

Parameters

  • -f, --add-prunefs FS: Add entries in the space-separated list FS to PRUNEFS.
  • -n, --add-prunenames NAMES: Add entries in the space-separated list NAMES to PRUNENAMES.
  • -e, --add-prunepaths PATHS: Add entries in the space-separated list PATHS to PRUNEPATHS.
  • -U, --database-root PATH: Store only the results of scanning file system subtrees rooted at paths for which the path of the database to be generated, by default, will scan the whole file system, i.e. /, and locate outputs entries as absolute pathnames, regardless of the forms of PATH is specified.
  • -h, --help: Display help information.
  • -o, --output FILE: Write the database to the file instead of using the default database. Default database location is /var/lib/mlocate/mlocate.db.
  • --prune-bind-mounts FLAG: Set PRUNE_BIND_MOUNTS to FLAG, overriding the configuration file, default is no.
  • --prunefs FS: Set PRUNEFS to FS, overriding the configuration file.
  • --prunenames NAMES: Set PRUNENAMES to NAMES, overriding the configuration file.
  • --prunepaths PATHS: Set PRUNEPATHS to PATHS, overriding the configuration file.
  • -l, --require-visibility FLAG: Set flag in the generated database for "require files' visibility before reporting" to FLAG, default value is yes. If FLAG is 0 or no, or the database file is readable by others or not owned by slocate, then locate outputs database entries that user running locate cannot read necessary directories to find files described by database entries. If FLAG is 1 or yes, locate checks the permissions of each entry's parent directory before reporting the parent directory of each entry to the calling user. To truly hide the existence of a file, the database group is set to slocate, and the database permissions prevent users from reading the user's database other than locate set-gid slocate. Note that visibility check only occurs when the database is owned by slocate and not readable by others.
  • -v, --verbose: Output the path names of files to standard output.
  • -V, --version: Output version information.

Examples

Update the database used by the locate command.

updatedb

Update the database used by the locate command and output the found files.

updatedb -v

Specify the directory for updating the database used by the locate command.

updatedb -U /home

Daily Question

https://github.com/WindrunnerMax/EveryDay

References

https://linux.die.net/man/8/updatedb
https://www.computerhope.com/unix/ulocate.htm
https://www.runoob.com/linux/linux-comm-updatedb.html