How to Replace a Specific Word Within a File in Linux..? (sed Command) | Secure 2 Cyber
In this video, you’ll learn how to replace a specific word inside a file in Linux using the powerful sed (Stream Editor) command.
The sed command is a versatile text manipulation tool that allows you to search, find, and replace words or patterns directly from the terminal — without opening the file in an editor.
🖥️ Commands Covered:
sed 's/oldword/newword/' file.txt → Replace first occurrence of the word in each line
sed 's/oldword/newword/g' file.txt → Replace all occurrences of the word
sed -i 's/oldword/newword/g' file.txt → Replace directly inside the file (save changes)
sed -n 's/word1/word2/p' file.txt → Display replaced lines only
💡 Use sed when you need to update config files, logs, or scripts automatically — it’s a must-know command for Linux users and cybersecurity professionals.
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