Web Reference: May 20, 2010 · I have a string like AxxBCyyyDEFzzLMN and I want to replace all the occurrences of x, y, and z with _. How can I achieve this? I know that echo "$string" | tr 'x' '_' | tr 'y' '_' would w... The procedure to change the text in files under Linux/Unix using sed: 1. Use Stream EDitor (sed) as follows: 2. sed -i 's/old-text/new-text/g' input.txt 3. It tells sed to find all occurrences of ‘old-text‘ and replace with ‘new-text‘ in a file named input.txt 4. The s is the substitute command of sed for find and replace. The -i tells to update th... Feb 21, 2026 · Use the sed command to find and replace strings in Linux files. Covers global replace, word boundaries, regex, dry-run previews, and recursive replace.
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