make code in Readme easier to copy

Thanks Sumeet Agarwal for the suggestion.

README.md

@@ -10,10 +10,10 @@ Running the code you want to run, and nothing else.
 Here's the Mu computer running [Conway's Game of Life](https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life).
 
 ```sh
-$ git clone https://github.com/akkartik/mu
-$ cd mu
-$ ./translate life.mu  # emit a bootable code.img
-$ qemu-system-i386 code.img
+git clone https://github.com/akkartik/mu
+cd mu
+./translate life.mu  # emit a bootable code.img
+qemu-system-i386 code.img
 ```
 
 <img alt='screenshot of Game of Life running on the Mu computer' src='html/baremetal-life.png'>
@@ -94,7 +94,7 @@ Mu programs build natively either on Linux or on Windows using [WSL 2](https://d
 For Macs and other Unix-like systems, use the (much slower) emulator:
 
 ```sh
-$ ./translate_emulated ex2.mu  # ~2 mins to emit code.img
+./translate_emulated ex2.mu  # ~2 mins to emit code.img
 ```
 
 Mu programs can be written for two very different environments:
@@ -203,9 +203,9 @@ If you're still reading, here are some more things to check out:
   for a postfix language that I might work on again one day:
 
   ```sh
-  $ cd linux
-  $ ./translate tile/*.mu
-  $ ./a.elf screen
+  cd linux
+  ./translate tile/*.mu
+  ./a.elf screen
   ```
 
 - [A summary](mu_instructions) of how the Mu compiler translates statements

shell/README.md

@@ -5,12 +5,12 @@ Currently runs a tiny dialect of Lisp. Steps to run it from the top-level:
 1. Build it:
 
   ```sh
-  $ ./translate shell/*.mu      # generates code.img
+  ./translate shell/*.mu      # generates code.img
   ```
 
   You can now already run it (under emulation):
   ```sh
-  $ qemu-system-i386 code.img
+  qemu-system-i386 code.img
   ```
 
   But let's add some more 'meat' to play with.
@@ -18,13 +18,13 @@ Currently runs a tiny dialect of Lisp. Steps to run it from the top-level:
 2. Create a data disk with a library of functions.
 
   ```sh
-  $ dd if=/dev/zero of=data.img count=20160
-  $ cat shell/data.limg |dd of=data.img conv=notrunc
+  dd if=/dev/zero of=data.img count=20160
+  cat shell/data.limg |dd of=data.img conv=notrunc
   ```
 
   Run with data disk (and 2GB of RAM):
   ```sh
-  $ qemu-system-i386 -m 2G -hda code.img -hdb data.img
+  qemu-system-i386 -m 2G -hda code.img -hdb data.img
   ```
 
   <img alt='screenshot of the Mu shell' src='../html/20210615-shell.png'>
@@ -59,7 +59,7 @@ Currently runs a tiny dialect of Lisp. Steps to run it from the top-level:
   Putting it all together, here's the command I typically use on Linux:
 
   ```
-  $ qemu-system-i386 -m 2G -enable-kvm -hda code.img -hdb data.img
+  qemu-system-i386 -m 2G -enable-kvm -hda code.img -hdb data.img
   ```
 
 *Known issues*