They are both applied to the output of the echo command. I have used two pipes with two sed commands, one to replace the word Athens with Rome and the other one to replace Greece with Italy. ~]$ echo "Athens is the capital of Greece" | sed 's/Athens/Rome/' | sed 's/Greece/Italy/' Then using the pipe I will pass the output of the echo command to the sed command and replace the words Athens and Greece with Rome and Italy. With the echo command I will print the message “Athens is the capital of Greece” in the terminal: ~]$ echo "Athens is the capital of Greece"
#Search for keywords in text files in terminal linux how to
I will start with a simple example that shows how to use the sed command directly in the Linux command line. The sed command stands for stream editor, it’s one of the most powerful Unix tools to filter and transform text. Time to start! Using the Sed Command to Replace a String With a Given Value The sed command allows to perform text manipulation and it can be called as part of your scripts in the same way you can do with other Linux or Unix commands.Ī practical example in which replacing strings in a file can be handy is when you want to generate files based on templates where certain strings are updated with user inputs.įirst of all, we will look at a few examples on how to use sed in the terminal and then I will show you how to call sed in your Bash scripts to replace one or multiple strings in a file.
To replace a string in a file using a Bash script you can use the sed command. Knowing how to replace a string in a file helps if you want to create Bash scripts to automate the configuration of systems or applications.
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