[Organize common Linux commands 4] search for files

Command 1: Which The "which command" can only find the directory where the command is located. Example: Which ls Command 2: whereis "Whereis command" to find and only find the directory where the command is located + the location of the help document   Whereis command Command location + help document location   Command 3: Find "Find path search mode parameter" allows you to find any file There are many ways to search: 1. Search by file name Search Method:-name Example: Find/T3-name file1   Note: wildcards can be used for file names. * Multiple characters ? Single Character Example: Find/T3-name fil *   2. Search by file size Search Method:-size (unit: 512 bytes, that is, KB) + 1000 -1000 = 1000 Example: Find/T3-name-1000   3. Search by file owner Search Method:-user Example: Find/T3-user xhc   4. Search by file group Search Method:-group Example: Find/T3-group greenday   5. search based on the last modification time Query Method:-ctime,-atime, and-mtime are measured in days. Query Method:-Cmin,-Amin, and-mmin are measured in minutes. C. Change refers to the file attribute. It refers to the permission, group, and owner changed. A access M modification indicates that the file content has been modified Parameters: + How long has it exceeded? -How long does it take? Nothing is written. Example: Find/T3-mmin-120   6. Search by file type Search Method:-type Example: Find/T3-type D 7. Search by I Node Search Method:-inum Example: Find/T3-inum 14 8. Multiple conditions -A logic and -O logic or Example: Find-size + 80-a-size-100   4. Search and perform operations Fixed format: Find XXX-exec command {}\; For example: Find/T3-mmin-120-exec LS-l {}\; find the modified files within two hours and list the details 5. Locate Locate XXX lists all XXX-Related Files Feature: It is fast, but the file database must be updated. Otherwise, the newly created file cannot be found and must be used with the updatedb command. 6. grep "Grep XXX file a" searches for XXX-related content in file.