I've couple of shell aliases defined in ~/.bashrc file. How do I temporarily remove (disable) a shell alias and call the core command directly without using unalias command?
An alias command enables a replacement of a word with another string. It is mainly used for abbreviating a system command, or for adding default arguments to a regularly used command.
Display currently defined aliases
Type the following command:
$ alias
Sample output:
alias cp='cp -i' alias dnstop='dnstop -l 5 eth1' alias grep='grep --color' alias l.='ls -d .* --color=tty' alias ll='ls -l --color=tty' alias ls='ls --color=tty' alias mv='mv -i' alias rm='rm -i' alias update='yum update' alias updatey='yum -y update' alias vi='vim' alias vnstat='vnstat -i eth1' alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde' alias vnstat='vnstat -i eth1'
Creating an alias
Create an alias called c for the commonly used clear command, which clear the screen:
$ alias c='clear'
Then, to clear the screen, instead of typing clear, the user would only have to type the letter c and press the [ENTER] key:
$ c
How do I disabled alias temporarily?
An alias can be disabled temporarily and the core command get called directly. Just prefix command with a backslash. Create an alias called vnstat:
$ alias vnstat='vnstat -i eth1'
$ vnstat
Sample output:
Database updated: Fri Mar 13 15:30:01 2009 eth1 received: 158.48 GB (20.9%) transmitted: 599.82 GB (79.1%) total: 758.30 GB rx | tx | total -----------------------+------------+----------- yesterday 2.83 GB | 10.90 GB | 13.73 GB today 1.92 GB | 7.31 GB | 9.23 GB -----------------------+------------+----------- estimated 2.97 GB | 11.28 GB | 14.25 GB
Now disabled vnstat alias temporarily, enter:
$ \vnstat
Sample output:
rx / tx / total / estimated
eth1:
yesterday 2.83 GB / 10.90 GB / 13.73 GB
today 1.92 GB / 7.31 GB / 9.23 GB / 14.24 GB
eth0:
yesterday 655.05 MB / 2.02 GB / 2.66 GB
today 438.01 MB / 1.43 GB / 1.86 GB / 2.86 GB
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{ 16 comments… read them below or add one }
When you said:
alias p='clear'I think you meant:
alias c='clear'Thanks for the heads up.
No problem, I do that kind of thing all the time myself. :)
You can also use `command’. If you have ls aliased to `ls -lh’, command ls will run the ls command as if there was no alias.
Also, you can see all the aliases from .bashrc or .bashcompletition or something else with
# alias TABThis will list all the aliases
You can temporarily disable it via
\
or with the full pathname of the command.
Michael
Sorry, the output was not correct. You can put an \ before the alias.
Sorry, the output was not correct. You can disable it when you put a \ before the alias.
Michael
Exactly – this was the meaning of author’s post! Did you read it ?
Yes I read the post but I thought it was a question not a statement. Sorry for the misunderstanding.
How about unaliasing?
say I’ve a few aliases defined in my ~/.bashrc and ls is one of them:
alias ls=’ls -alhF’
so on prompt to disable it temporarily I will say:
> unalias ls
and done……how about this solution?
unalias [-a] [name ...]
Remove each name from the list of defined aliases
I think that will be removed permanently.
There seem to be some useful tips here – I usually do something like /bin/rm to avoid the rm -i alias. Of course you can always use the -f argument with cancels out -i.
Another thing you could do ( if you wanted to use an unedited version of the command ) would be to start up a sub-shell.
Something along the lines of……
bash
unalias ls
ls
exit
When you exit back out to the parent shell, your unalias is forgotten.
Doesn’t control-L clear the screen?
Yes it is ?
This is not about clearing screen. It is about disabling aliases.