Use input-output redirection (>, >>, |, 2>, etc.)

Context: RHCSA certification

 Use input-output redirection (>, >>, |, 2>, etc.)

In the context of the RHCSA (Red Hat Certified System Administrator) certification, understanding input-output redirection is crucial as it allows you to manipulate command output and control the flow of data. Here are some common redirection operators:

1. > (Output Redirection): The > operator redirects the standard output of a command to a file. If the file doesn't exist, it is created. If it already exists, it gets overwritten. For example:

   ls > file.txt

2. >> (Appending Output): The >> operator appends the standard output of a command to a file. If the file doesn't exist, it is created. If it already exists, the output is appended to the end of the file. For example:

   echo "New content" >> file.txt

3. < (Input Redirection): The < operator redirects the contents of a file as the input for a command. It is used to provide input from a file instead of the keyboard. For example:

   sort < file.txt

4. | (Pipe): The | operator allows you to send the output of one command as input to another command. It connects the standard output of the first command to the standard input of the second command. This is useful for chaining commands together. For example:

   ls -l | grep "file"

5. 2> (Error Redirection): The 2> operator redirects the standard error (stderr) output of a command to a file. It is used to separate error messages from regular output. For example:

   command_not_found 2> error.log

These are just a few examples of how input-output redirection can be used in Linux. It's important to practice and experiment with these operators to gain proficiency in their usage.