To remove ^M (carriage return) characters from input using sed, you can use the following command:
sed 's/^M//g'
This command will search the input for any ^M characters, and delete them. The g flag specifies that the substitution should be performed globally, on all occurrences of the pattern.
Note that the ^M character is not a literal character, but rather a representation of the CR (carriage return) character in a text file. To enter the ^M character in a sed command, you will need to type CTRL+V followed by CTRL+M.
For example, if you have the following input:
This is a test^M This is another test^M
Running the sed command above will output:
This is a test This is another test
You can also use the tr command to delete the CR character from a file:
tr -d '\r' < input_file > output_file
This will delete all CR characters from the input_file, and write the resulting output to output_file.
By using the s/^M//g substitution command or the tr command, you can remove ^M (carriage return) characters from input. This can be useful for processing text data or for removing unnecessary characters from a script.