Reformat date

bash

sed -E 's/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/\2\/\3\/\1/'

Explanation

Uses capture groups and backreferences in the replacement.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing sed and Stream Editing

Remove trailing whitespace from each line.

Open In sheetbashsame section

Add a prefix only to non-empty lines.

Open In sheetbashsame section

Print only the content inside double quotes on each line.

Open In sheetbashsame section

Replace all runs of whitespace with a single space.

Open In sheetbash1 tag match

Find full-word matches in files.

Avoid backtracking inside a grouped token.