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shopt -s expand_aliases
alias foo=echo
< /dev/null foo bar
< /dev/null x=value
echo $x
< /dev/null x=newvalue foo bar
echo $x
# problem reported by Vincent Lefevre
alias a="echo OK >&2"
a
> /dev/null a
${THIS_SH} -c 'shopt -s expand_aliases; alias a="echo OK >&2"
a
> /dev/null a'
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