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shell guide: remove event designator "!?" #548

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shell guide: remove event designator "!?" #548

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2 changes: 1 addition & 1 deletion shellguide.md
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Expand Up @@ -936,7 +936,7 @@ statement, and otherwise be wary of its expression evaluating to zero
```shell
# Simple calculation used as text - note the use of $(( … )) within
# a string.
echo "$(( 2 + 2 )) is 4!?"
echo "$(( 2 + 2 )) is 4"

# When performing arithmetic comparisons for testing
if (( a < b )); then
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