Add Run A Command Repeatedly Several Times as a Unix TIL

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1297 TILs and counting..._
+_1298 TILs and counting..._
 
 ---
 
@@ -1293,6 +1293,7 @@ _1297 TILs and counting..._
 - [Provide A Fallback Value For Unset Parameter](unix/provide-a-fallback-value-for-unset-parameter.md)
 - [Remove A Directory Called `-p`](unix/remove-a-directory-called-dash-p.md)
 - [Repeat Yourself](unix/repeat-yourself.md)
+- [Run A Command Repeatedly Several Times](unix/run-a-command-repeatedly-several-times.md)
 - [Safely Edit The Sudoers File With Vim](unix/safely-edit-the-sudoers-file-with-vim.md)
 - [Saying Yes](unix/saying-yes.md)
 - [Search Files Specific To A Language](unix/search-files-specific-to-a-language.md)

unix/run-a-command-repeatedly-several-times.md

@@ -0,0 +1,17 @@
+# Run A Command Repeatedly Several Times
+
+From the terminal in a Bash or Zsh shell session, I can loop on a command to
+have it run a specific number of times.
+
+If I want to run a test command (e.g. `bin/test some_file.spec:123`) 12 times
+in a row, I could use a for loop like so:
+
+```bash
+for i in {1..12}; do bin/test some_file.spec:123; done
+```
+
+And the shell will run the command one time after another until it has been run
+12 times. That range `{1..12}` can be adjusted to whatever I want. For
+instance, to have it loop 3 times, I'd make it into `{1..3}`.
+
+[source](https://serverfault.com/questions/273238/how-to-run-a-command-multiple-times-using-bash-shell)