No difference it seems. Wikipedia (!) states:
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alias # Used without arguments; displays a list of all current aliases
alias -p # Analogous to the above; not available in 4DOS/4NT and PowerShell
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alias # Used without arguments; displays a list of all current aliases
alias -p # Analogous to the above; not available in 4DOS/4NT and PowerShell
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alias [-p] [name[=value] ...]
Alias with no arguments or with the -p option prints the list
of aliases in the form alias name=value on standard output.
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w3m http://weather.weatherbug.com/MY_STATE/MY_TOWN-weather.html -dump\
| grep -i 'hi:\|lo:\|rain:\|humidity:\|dew point:'
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ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/ /' -e 's/-/|/'
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sudo tail -f /var/log/messages
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sudo tail -fn1 /var/log/messages | espeak
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fc-list | cut -d : -f 2 | sort -u | uniq
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pstree
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[[ $string = *$substring* ]] && echo "$substring is in $string"
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[[ $(<fileA) = *$(<fileB)* ]] && echo "fileA contains fileB"