kekneus373 · February 10, 2026 18:20 · Feb 10, 2026
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+Remove Line Breaks with Sed
+===========================
+
+**`sed` operates on lines, excluding the newline character**, so it cannot directly remove newlines within a line using standard commands. The newline is stripped before processing and added back after. To remove or replace newlines, you need special techniques:
+
+- **Replace all newlines with spaces**:
+  ```bash
+  sed -e ':a;N;$!ba;s/\n/ /g' file
+  ```
+  This reads the entire file into the pattern space and replaces all newlines with spaces.
+
+- **Remove all newlines (flatten to one line)**:
+  ```bash
+  sed -z 's/\n//g' file
+  ```
+  The `-z` option treats input as null-separated, allowing `sed` to process newlines as data.
+
+- **Remove only trailing newlines**:
+  ```bash
+  sed -z '$ s/\n$//' file
+  ```
+  This removes the final newline, useful when preserving the POSIX text file standard.
+
+- **Remove newlines only between specific patterns** (e.g., lines not ending with `"`):
+  ```bash
+  sed '/"$/{:a;N;s/\n//;ta}' file
+  ```
+  This appends lines until a line ends with `"` and removes newlines in between.
+
+For simple cases, **`tr -d '\n'`** is often faster and more reliable than `sed`.
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