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x=a; x=b echo $x why $x is a? according to your answer, it should be b!

Farid Cheraghi
– Farid Cheraghi

2020-10-28 16:02:39 +00:00
Commented Oct 28, 2020 at 16:02
2

x=b only within the echo command (whether builtin or binary). The $x substitution is performed well before that, in the shell. For example perl sees the environment variable as set to b x=a; x=b perl -e 'print $ENV{"x"}; print "\n"' but will print a if the substitution is done at time of invocation of course! x=a; x=b perl -e "print qq($x\n);"

Dan
– Dan

2020-11-02 00:15:20 +00:00
Commented Nov 2, 2020 at 0:15

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