Siege Lion on the Way (iii) Linux (16)---command and file lookup

One, the script file query:

1, command format: which [-a] command; <== is found through path.

-A: Lists all, not only the first.

Example: which ifconfig;

Note: Because different user paths are different, there may be differences in the results.

Second, the name of the search:

1, Whereis [-BMSU] file or directory name <== through the database to find, so different users find the results are consistent.

Parameter description:

-B: Only files in binary format are found.

-M: Only files found under the manual path of the description file.

-S: Only source files are found.

-U: A file other than the above three conditions.

2, locate:<== through the database to find, so different users find the results are consistent. It's/var/lib/mlocate.

Locate [-ir] keyword

Parameter description:

-I: Ignores case differences.

-R: The following can be a regular expression.

3, UpdateDB command will refresh the above mentioned database, but it is time-consuming.

4. Find [PATH] [option] [action]

A, time-related parameters:-atime\-actime\-mtime

-mtime files that have been changed within 24 hours of the N-day period.

-mtime files that have been changed before +n:n days (not included).

-mtime-n:n within days (including) files that have been changed.

Example: Find/mtime 0;

B, parameters related to the user or user group:

-uid N: Follow-up instructions.

-gid N: Follow-up instructions.

-user name: such as Vbird.

-group name: such as users.

-nouser: The user's file does not exist.

-nogroup: The file for the user group does not exist.

C. Parameters related to file permissions and names:

-name FileName: Finds the file named filename.

-size [-+] Size: Files larger or smaller than size, such as-size +50k

-type type: Find by file type, f\b\c\d\l\s\p ...

-perm mode: Find files with file permissions just equal to mode.

-perm-mode: Attributes are all included.

-perm +mode: A file that contains any of the mode permissions.