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--- bash [2022/03/01 10:24] – examples elsewhere rjt
+++ bash [2024/01/10 10:59] (current) – Move all files in subdirectories to parent rjt
@@ Line 2: / Line 2: @@
 The **__B__ourne __A__gain __Sh__ell** is the default command language / shell in [[Linux]], and I've never bothered to try any other. You type stuff in (or paste it from stackexchange...) and useful stuff happens.
+===== Features =====
+==== Arguments ====
+You can use [[getopts]] to read arguments attached to the command. You use a ''while'' loop and a ''case'' statement to figure out what to do with the arguments/flags entered.
+In this example you can use ''-i'' and ''-o'' arguments to specify file names and they will be stored in variables ''input'' and ''output''.
+<code bash>
+while getopts :io flag
+do
+	case $flag in
+		i) input=${OPTARG} ;;
+		o) output=${OPTARG} ;;
+	esac
+done
+</code>
+==== Conditional Constructs ====
+=== if ===
+-n string True if the length of string is non-zero. -a file True if file exists. DPMT USE -a, it's weird
+In the documentation of test you will also see a the switch -e. This switch tests the following argument and evaluates to true if that argument is a file or directory that exists. More useful still is the -f switch which evaluates to true if the following argument exists and is a regular file (as opposed to a directory or a block device, or whatever).
+=== case ===
 ===== Examples =====
@@ Line 19: / Line 48: @@
 	mv -- "$file" "$(mktemp --dry-run XXXXXXXX.jpeg)"
 done
+</code>
+==== Move all files in subdirectories to parent ====
+  * https://unix.stackexchange.com/questions/358284/move-all-files-inside-sub-folders-to-parent-folder
+<code bash>
+find . -mindepth 2 -type f -print -exec mv {} . \;
 </code>