Add 0

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diff --git a/bash.md b/bash.md
index 6258795..87eb04d 100644
--- a/bash.md
+++ b/bash.md
@@ -78,6 +78,10 @@ All keys:
     ${!array[*]}
     ${!array[@]}
 
+## Commandline arguments
+
+* `$#`: number of arguments.
+
 ## Getopts example
 
     while getopts 'a:b:c' flag; do