From b08fc0727a7086560b9cd9217fdab5d07ffee45f Mon Sep 17 00:00:00 2001
From: Johannes Stoelp <johannes.stoelp@gmail.com>
Date: Tue, 13 Feb 2024 00:36:48 +0100
Subject: bash: cmd grouping

---
 src/tools/bash.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/tools/bash.md b/src/tools/bash.md
index a2b7944..e12d8c0 100644
--- a/src/tools/bash.md
+++ b/src/tools/bash.md
@@ -112,6 +112,22 @@ once.
 vim -d <(grep foo bar) <(grep foo moose)
 ```
 
+## Command grouping
+
+Execute commands in a group with or without subshell. Can be used to easily
+redirect stdout/stderr of all commands in the group into one file.
+```bash
+# Group commands without subshell.
+v=abc ; { v=foo; echo $v; } ; echo $v
+# foo
+# foo
+
+# Group commands with subshell.
+v=abc ; ( v=foo; echo $v; ) ; echo $v
+# foo
+# abc
+```
+
 ## Argument parsing with `getopts`
 
 The `getopts` builtin uses following global variables:
-- 
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