Piping and Redirection

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Last updated 7 months ago

1.Redirect

Stream Name

Description

Standard Input (STDIN)

Data fed into the program

Standard Output (STDOUT)

Output from the program

Standard Error (STDERR)

Error messages (defaults to)

Type Standard

Standard Input 0 ( STDIN )
Standard Output 1 ( STDOUT )
Standard Error 2 ( STDERR )

Redirecting to an Existing File

In Case Redirect Output , U Can Using > Operator To Store Or Redirect Output In File

kali@kali:~$ echo "that is maintained and funded by Offensive Security" >>
redirection_test.txt
kali@kali:~$ cat redirection_test.txt
Kali Linux is an open source project
that is maintained and funded by Offensive Security

Redirecting from a File

root@root:~$ wc -m < php.php
89

Redirecting to a New File

kali@kali:~$ ls
Desktop Documents Downloads Music Pictures Public Templates Videos
kali@kali:~$ echo "test"
test
kali@kali:~$ echo "test" > redirection_test.txt
kali@kali:~$ ls
Desktop Documents Downloads Music Pictures Public redirection_test.txt Template
kali@kali:~$ cat redirection_test.txt
test
kali@kali:~$ echo "Kali Linux is an open source project" > redirection_test.txt
kali@kali:~$ cat redirection_test.txt
Kali Linux is an open source project

In Case Insert In File Not Use Override In Case Using Just > U Can Use >> To Insert In File , And Save The Old Value

Redirecting STDERR

kali@kali:~$ ls .
Desktop Documents Downloads Music Pictures Public redirection_test.txt Template
kali@kali:~$ ls ./test
ls: cannot access '/test': No such file or directory
kali@kali:~$ ls ./test 2>error.txt

in Case Passing STRDINT Standard Input Using <

2.Piping

Return Result From 1st Function Or Output And Passing As A Value To 2nd Tool Or Function

tee Command Using To Show Result And Store In File , U Can Append In File Because IF U Use Normal Use Delete Old Data, U Can Use Switch -a To Append ls | tee -a

And U Can Using Other xargs To Control Result And Execute Same Actions

In Case Show Errors In Kali U Can Show Result And Comments In The Kali website Bugs And Search From Your Errors https://bugs.kali.org

Kali Linux adheres to the filesystem hierarchy standard (FHS) Which provides a familiar and universal layout for all Linux users