Examples not working properly

[mehdi-drissi]

Run under macOS
Zsh terminal

Error in example on minima:
sed: 1: "temp": undefined label 'emp'
awk: syntax error at source line 1
context is
>>> NR=={ <<<
awk: bailing out at source line 1
(standard_in) 1: parse error

Error in example on gradient:
sed: -i may not be used with stdin
sed: -i may not be used with stdin
sed: -i may not be used with stdin
sed: -i may not be used with stdin
...

[mehdi-drissi]

Fixed by commit 9336b34