shopt -s expand_aliases

# from an austin-group report
alias foo="echo 'Error:"
foo bar'

# from some FreeBSD sh tests

v=1
alias a='unalias -a
v=2'
eval a
[ "$v" = 2 ] && echo ok 1
v=1
alias a='unalias a
v=2'
eval a
[ "$v" = 2 ] && echo ok 2

# make sure command doesn't ever reset anything even if it's made a keyword
unalias -a
alias command=command
alias true='echo bad'
eval 'command true'

unalias -a
alias alias0=command
alias true='echo bad'
eval 'alias0 true'

# make sure null aliases are ok
unalias -a
alias nullalias=''
alias foo='echo '
foo nullalias text
unalias foo

# aliases shouldn't be expanded in quoted strings even when the previous word
# is an alias whose expansion ends in a space
alias foo="echo 'whoops: "
foo nullalias'

unalias -a

# recursive alias definitions
alias echo=echo
eval echo foo

alias echo='echo a'

echo
echo b
eval echo b
echo $(eval echo b)

unalias -a

# alias expansion when in a command position after redirections
alias e=echo
eval '</dev/null e ok 3'
eval 'a=true e ok 4'

alias comment=#
comment

alias long_comment='# for x in '
long_comment text after

# comment
comment foo bar