Variable assignment not working with Bash -s and heredoc

Asked Jan 12 '23 at 19:25

Active Jan 12 '23 at 19:25

Viewed 16 times

When I run the following, $ echo 'ASD=123; echo $ASD hi' | bash -s, the output is exactly what I expect, 123 hi. But when I use a heredoc like so:

$ bash -s <<EOF
ASD=123; echo $ASD hi
EOF

The output is hi, which is not what I expect. If I add single quotes around $ASD, it prints hi. Why is the variable assignment not working when I use a heredoc?

asked Jan 12 '23 at 19:25

The Bic Pen

1

The variable is being expanded by the original shell. You need to use `<<'EOF'` to prevent this. – Barmar Jan 12 '23 at 19:27
That works, thanks! I missed that info in the bash docs. – The Bic Pen Jan 12 '23 at 19:30

Variable assignment not working with Bash -s and heredoc

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