Update 'bash_programming.md'

2022-09-07 17:31:20 -05:00 · 2022-09-07 17:31:20 -05:00 · fcdb4f385e
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 ```

 Common bash test expressions
-https://www.gnu.org/software/bash/manual/html_node/Bash-Conditional-Expressions.html
+https://www.gnu.org/software/bash/manual/html_node/Bash-Conditional-Expressions.html and https://stackoverflow.com/a/21164441
 ```
 The following test operators return "True" if the file exists
 -a file :: Any file type