find files with extension linux code example

Example 1: how can I find perticular extension in ubuntu?

find . -type f -name "*.txt"

Example 2: terminal find file by extension recursive

find /directory/path -type f -name "*.in"

Example 3: find file

Extremely useful command!!
In Mac and Linux: Define directory where to search as "." for current directory
and then specify the name or regex of file or folder to find.

find . -name "foo*"  

In Windows: Define "/s" for a recursively search and name or regex of file or
folgder to search

dir /s "foo*"

Example 4: find linux with extension

find /home/username/ -name "*.err"

Example 5: linux find file

# syntax 
# find *</path/to/dir> '(' *<Filter-1> *<and/or-operator> *<filter-2> ')'

# example 
find . '(' -name "Test*.pm" -a ! -name 'Useless*' ')'