Linux Learning Notes-Search command __linux

#whereis [Options] [command name] feature: The path where the search command resides and its help document location

Options:-B get command location only;-M get help document location only

#which [command name]

Function: Search the path and alias of the command

#locate [FileName]

Function: In the background database "/var/lib/mlocate", search by filename

Note: 1, locate to include matching;

2, the corresponding background database is not updated in real time, so the recently generated files can not be searched;

3, #updatedb命令可以实时更新数据库

Whereis which locate these three commands, following the search rules specified by the configuration file/etc/updatedb.conf:

#find [Search in] [search conditions]

Function: Within specified range, search for files that meet specified criteria

Option:-name Search by filename (exact match);

-iname Search by filename (exact match), case-insensitive;

-user Search by file owner;

-nouser search for files without owner

#find/var/log/-mtime +10 Search log directory 10 days ago Last modified content file

#find/var/log/-ctime-10 searches the log directory for the last 10 days to change the properties of the file

#find/var/log/-atime 10 searches the log directory for the last file accessed 10 days in the same day

#find/var/log/-size 25k Search log directory file size equal to 25k files

#find/var/log/-size +25m search for files with a file size greater than 25M in the log directory

#find/var/log/-size-25k Search Log directory file size less than 25k files----k lowercase, M caps, the default unit is the data block (512 bytes)

#find. -inum 262422 searches for files in the current directory where I node is 262422

#find/var/log/\ (-size +5k-a-size-100k \)

Search for files with a file size greater than 5k below 100k in the log directory

#find/var/log/\ (-name "*.log"-a \ (-mtime-1-o-mtime +5 \) \)-----a "and"; -O "or"

Search for files with the file name ending with ". Log" in the log directory, and the last modified time is not within 1-5 days

#find. -name "file*"-exec Ls-ilh {} \;

Searches for files with file names beginning with "File" in the previous directory and displays the details of the file

#find/var/log/-name "an*"-o-name "*.log"-ok rm-rf {} \;

Search the log directory for files that start with "an" or End with ". Log", and then ask before deleting

#grep [Options] [strings] [filename]

Function: Searches the specified file for the specified string and prints the line containing the string (including matching)

Options:-I ignores case,-V excludes the specified string