How to search or find files in Linux OS

1, find

find everything you want to find

find /etc -name "*in*" -ls

2, whereis

used to find the program

whereis grep

-b binary -m man -s source

whereis -b grep

3, grep

find the content in the file, not used to find file itself

grep abc file1

4, locate

equals to "find -name", but faster than latter

locate /etc/sh find all files start with sh in /etc

locatedb is in /var/lib/locatedb

updatedb

5, which

find where the command is in of the PATH envirment

which find

6, type

not used for find,  used to talk the command is build in or outer

type cd

but type -p cd will show the path of the cd command

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Kind Regards,
Yonggang Meng