tee command in Linux with examples

Input:geeks
      for
      geeks

SYNTAX :

geek@HP:~$ wc -l file1.txt|tee -a file2.txt

OUTPUT :

3 file1.txt

geek@HP:~$cat file2.txt
OUTPUT:
      geeks
      for
      geeks
      3 file1.txt

2.–help Option : It gives the help message and exit.
SYNTAX :

geek@HP:~$ tee --help

3.–version Option : It gives the version information and exit.
SYNTAX :

geek@HP:~$ tee --version

Application

Suppose we want to count number of characters in our file and also want to save the output to new text file so to do both activities at same time, we use tee command.

geek@HP:~$ wc -l file1.txt| tee file2.txt
OUTPUT:
geek@HP:~$15 file1.txt

Here we have file1 with 15 characters, so the output will be 15 and the output will be stored to file2. In order to check the output we use :

geek@HP:~$ cat file2.txt
OUTPUT:
geek@HP:~$15 file1.txt