Meet Alex, a system administrator who needs to modify a large number of configuration files on a Linux server. The files contain a specific setting that needs to be updated, but there are hundreds of files to change. Manually editing each file would be a tedious and time-consuming task. That's when Alex discovers the power of the sed command. The Problem Alex has a file called config.txt with the following contents:
sed -i 's/old_password/new_password/' config.txt This command updates the original file config.txt with the new password. What if Alex needs to update the password in multiple files? sed can handle that too: Setedit Command
sed 's/old_password/new_password/' config.txt The s command in sed stands for "substitute." It searches for the pattern old_password and replaces it with new_password . Running the sed command produces the following output: Meet Alex, a system administrator who needs to
# Update password in config files sed -i 's/old_password/new_password/' /path/to/config/*.txt That's when Alex discovers the power of the sed command
sed 'expression' file.txt In this case, Alex wants to replace old_password with new_password in the config.txt file. The sed command to achieve this is: