Add the "Bash: Brace expansion" page.

Author: paveloom

content/notes/Bash.md

@@ -6,5 +6,6 @@ Bash is an interactive command interpreter and command programming language deve
 
 Subpages:
 
+- [Brace expansion](@/notes/Bash_Brace_expansion.md)
 - [Parameter expansion](@/notes/Bash_Parameter_expansion.md)
 - [Positional parameters](@/notes/Bash_Positional_parameters.md)

content/notes/Bash_Brace_expansion.md

@@ -0,0 +1,29 @@
++++
+title = "Bash: Brace expansion"
++++
+
+In Bash, brace expansion is a mechanism by which arbitrary strings may be generated.
+
+It has two forms:
+
+1. Comma-separated strings.
+
+   For example, `a{d,c,b}e` expands to `ade ace abe`.
+
+2. Sequence expression.
+
+   For example,
+
+   - `S{1..4}` expands to `S1 S2 S3 S4`;
+   - `{0..4..2}` expands to `0 2 4`;
+   - `{a..f}` expands to `a b c d e f`.
+
+Brace expansions can be combined. For example, `{a..b}{1..2}` expands to `a1 a2 b1 b2`.
+
+Brace expansions tend to be most useful when dealing with file paths (especially if the paths are long and some of the files don't exist yet). For example, `mv /long/path/to/file_{old,new}`.
+
+See [`man bash`](https://www.man7.org/linux/man-pages/man1/bash.1.html) for more information.
+
+## See also
+
+- [Bash](@/notes/Bash.md)