Thanks for clearing that up for me hans (and Dale).
I'll still steer clear of aliases though. When I find myself doing
something repetitively, I'll write a script. ;)
On 10/27/2010 02:04 PM, der.hans wrote:
moin moin Eric,
An alias will only get expanded in place of a command.
$ .. # .. gets replaced by Matt's alias ( if you have it )
$ cd .. # is the string ˙..'
aliases are not expanded in every location, just the first place.
From the bash man page: "Aliases allow a string to be substituted for a
word when it is used as the first word of a simple command."
Not sure what happens if you use sudo to run an alias.
If the alias is available ( since you're changing users that's not
absolutely certain ), I would think it gets expanded when sudo tries to
run the command.
sudo ..
I think that would switch to the root user, then try to run the ..
command. If Matt's alias is available, then it would be run ( rather
pointlessly in this case ). I believe sudo would be handed .. as the
command rather than Matt's alias expansion.
command completion functions might change that such that "sudo ..<tab>"
would auto-expand the alias to "sudo cd .." on the command line.
ciao,
der.hans
Am 27. Oct, 2010 schwätzte Eric Shubert so:
On 10/27/2010 01:02 PM, Matt Graham wrote:
From: Eric Shubert<[email protected]>
On 10/27/2010 12:30 PM, Matt Graham wrote:
alias ..='cd ..'
alias ...='cd ../..'
....and I don't believe you can write a script named ".." without
a lot of fooling around....
What happens though when you try to use the real command? Does it
result in: $ cd cd ..
"man bash" , the ALIASES section:
The first word of the replacement text is tested for aliases, but a
word that
is identical to an alias being expanded is not expanded a second
time. This
means that one may alias ls to ls -F, for instance, and bash does not
try to
recursively expand the replacement text.
No idea what non-bash things do.
That doesn't appear to me to say you won't get
$ cd cd ..
if you type
$ cd ..
when your alias is defined.
--
-Eric 'shubes'
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