A Linux whereis command every day

The Whereis command can only be used for program name searches, and only binary files (parameter-B), man description file (parameter-m), and source code file (parameter-s) are searched. If the argument is omitted, all information is returned.

Whereis looks very fast when compared to find, because the Linux system records all the files in the system in a single database file, and when you use Whereis and the locate described below, the data is looked up from the database, not like the Find command. By traversing the hard drive to find, the efficiency will naturally be very high.

However, the database file is not updated in real time and is updated once a week by default, so when we use Whereis and locate to find files, we sometimes find data that has been deleted, or just created the file, but cannot find it because the database file is not updated.

1. Command format:

Whereis [-BMSU] [BMS directory name-f] File name

2. Command function:

The whereis command locates the location of the executable file, the source code file, and the Help file in the file system. The properties of these files should belong to the original code, binary files, or Help files. The Whereis program also has the ability to search for source code, specify alternate search paths, and search for unusual items.

3. Command parameters:

- b locating the executable file

- m location Help file

- s locating source code files

4. usage Examples:

Example 1: Find files related to a file

Command:

Wheseis ls, where CD,Whereis Redis (Redis source package compiled and installed)

Output:

[BEGIN] 2015/12/30 23:59:17[[email protected] ~]# whereis Lsls:/bin/ls/usr/share/man/man1p/ls.1p.gz/usr/share/man/ Man1/ls.1.gz[[email protected] ~]# whereis CDCD:/usr/share/man/man1p/cd.1p.gz/usr/share/man/man1/cd.1.gz[[email Protected] ~]# Whereis Redisredis:/etc/redis.conf/usr/local/bin/redis.conf/usr/local/redis[[email protected] ~]# Whereis Tomcattomcat:[end] 2015/12/30 23:59:51

Description: Tomcat is not installed, can not find out, Redis installation found a lot of related files

Example 2: Only binary files are found

Command:

whereis-b Redis

Output:

[BEGIN] 2015/12/31 0:05:09[[email protected] ~]# whereis Lsls:/bin/ls/usr/share/man/man1p/ls.1p.gz/usr/share/man/ Man1/ls.1.gz[[email protected] ~]# whereis-b Lsls:/bin/ls[[email protected] ~]# whereis-m Lsls:/usr/share/man/man1p/ls .1p.gz/usr/share/man/man1/ls.1.gz[[email protected] ~]# whereis-s Lsls:[end] 2015/12/31 0:05:31

Description: Whereis-b find ls executable path whereis-m ls isolated description document path, whereis-s LS find source file.

A Linux whereis command every day