Redirection and Pipes commands | Devops

Redirection:
THe redirection operator connects a command with a file.


1. date "greater then sign" date.txt
This command is used to redirects the standard output of a command to a file if it already exist.
2. date "double greater then sign" date.txt
This command is used to redirects the standard output of a command to a file but append the output to the end of a file instead of overwriting it.
3. date1 2"greater then sign" error.txt
This command is used to redirect the standard error output of a command to a file.
4. date 2"double greater then sign" date.txt
This command is used to redirects the standard error of a command to a file but append the output to the end of a file instead of overwriting it.
5. date "greater then sign" output.txt 2"greater then sign" error.txt
This command is used to redirect both the standard output and standard error of a command to the same location.
6. date "greater then sign"output-error.txt 2"greater then sign"&1
This command is used to redirect both the standard output and standard error of a command to the same location
7. cat "double less then sign"EOF "greater then sign"file1.txt
"here document" is the convenient way to provide input data to a command or script in a structurd manner.

Pipes:
THe pipe operator connect the output of one command with the input of second command.

8. cat file1.txt |sort
9. cat file1.txt |uniq|sort

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