I would like to create an alias to rm command in order to have a confirmation message after executing this command. So I am creating an alias like this alias rm='rm -i'. But as far as I know this is a temporary alias and it lives until you close the terminal.

As it is explained here to save alias permanently I need to execute ~/.bash_aliases or ~/.bashrc commands in terminal and add my alias there. But when I execute ~/.bashrc I get following error message :

bash: /home/bakhtiyor/.bashrc: Permission denied

When I run ~/.bash_aliases I get another error message like this:

bash: /home/bakhtiyor/.bash_aliases: File or directory doesn't exist.

What is the actual problem and how can I solve it?

up vote 342 down vote accepted

To create an alias permanently add the alias to your .bashrc file

gedit ~/.bashrc

And then add your alias at the bottom.

Now execute . ~/.bashrc in your terminal (there should be a space between the . and ~/.bashrc.

Now you can check your alias.

  • 4
    @karthick87 you wrote "Now execute . ~/.bashrc in your terminal (there should be a gap between the . and ~/.bashrc.". Why is this step needed? –  Geek Feb 11 '14 at 15:21
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    what does the first '.' do in . ~/.bashrc ? –  Zen Jul 16 '14 at 4:13Men's Sneaker Camper K100226 Brown Four Runner zUddWTFq
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    @Geek @Zen "Execute" was not the correct term. The dot is equivalent to source. With . ~/.bashrc, you source your bash. Executing the file would start a child process, execute the commands in this process, then return. All that is done in the child process has no effect on the parent process (the bash from which you executed). Instead, sourcing (with the dot) acts exactly as if you wrote the content of the file in the terminal. This is what you want. .bashrc is sourced everytime you start a bash. If you make changes, they won't apply until you start a new bash or source manually. –  Gauthier Oct 3 '14 at 9:19
  • @ButtleButkus - might want to change just one user's preferences rather than the whole system. In Ubuntu the system-wide .bashrc file is /etc/bash.bashrc –  WillC Oct 26 '16 at 3:30
  • This only works partially. I need to execute . ~/.bashrc every time I open the terminal. Using OS X EI Captian (v10.11.6). –  Shubham A. Apr 8 '17 at 16:25

There are lot of ways to create alias. The most used ways are :

  1. Add aliases directly in your ~/.bashrc file

    For example : append these line to ~/.bashrc file

    alias ll='ls -l' alias rm='rm -i'

    Next time (after you have logged out/in, or done . ~/.bashrc) when you type rm the rm -i command will be executed.

  2. The second method lets you make a separate aliases file, so you won't have to put them in .bashrc, but to a file of your choice. First, edit your ~/.bashrc file and add or uncomment the following lines, if it is not already

    if [ -f ~/.bash_aliases ]; then . ~/.bash_aliases fi

    Save it and close the file. After that, all you have to do is create a ~/.bash_aliases file and add your aliases there, with the same format specified in the first method.

    Contents of my ~/.bash_aliases file:

    alias cs='cd;ls'
  • 59
    +1 for using ~/.bash_aliases. –  ændrük Jun 10 '11 at 5:48
  • Yep, using another file for aliases is much more clean, also portable between distros. I do use that file to because some alias are not enough and a function is needed. So it's more much clean if you use a file for that task instead. I have another alias -> alias aliases="xdg-open ~/.bash_aliases && source ~/.bash_aliases", so the alias became avail at saving, and if you make some mistake it will advert you. –  erm3nda Apr 27 '17 at 12:08
  • somehow after I added the alias such as alias ls='ls -althr', some of the flags given would not take effect, in this case the -t flag didn't take effect. do you know why? –  Sajuuk Mar 22 at 8:43
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    By default ~/.bashrc contains inclusion for ~/.bash_aliases, no need to edit it. –  Jaakko May 14 at 9:49
  • Not always ~/.bashrc contains inclusion for ~/.bash_aliases as was in my case with Ubuntu terminal Windows 10 this solution came very handy. –  Jose Brun Casual Enzo Boot Fox Men's Chukka Golden May 30 at 18:10

The problem is that you are trying to execute a non executable file: You can check this with:

ls -la ~/.bashrc Golden Enzo Boot Brun Fox Men's Casual Chukka -rw-r--r-- 1 username username 3596 2010-08-05 Golden Enzo Fox Casual Brun Men's Boot Chukka 17:17 /home/pt001424/.bashrc

Note there is no "x - executable" letter on the first column (file permissions).

Profile files are not executable files, instead of executing them you load them with:

source /home/bakhtiyor/.bashrc

or

. /home/bakhtiyor/.bashrc

It sounds to me like your only problem is simply trying to execute .bashrc when it is not executable. But this isn't the correct way to do it; whenever you make a change to this file, you should "execute" it by the command:

source ~/.bashrc

Otherwise, it will simply create a new shell, execute the file in the new shell's environment, then discard that environment when it exits, thereby losing your change. By sourcing the script, it executes within the current shell, so it will remain in effect.

I'm assuming the second error was because bash_aliases does not exist. It is not required, just recommended to keep your changes separate and organized. It is only used if it exists, and you can see the test for it in .bashrc:

if [ -f ~/.bash_aliases ]; then . ~/.bash_aliases fi

This says that if the file ~/.bash_aliases exists, then run it.

echo "alias vps='ssh -X user@example.com'" >> ~/.bashrc

This is an example I was looking for, a way to type a few letters at the terminal ("vps") to remotely log in to a server and enable X11 forwarding so I can run gui apps like "gedit" over the network.

Whatever the command / aliased command, this way with the echo statement, quotation marks, and the symbol for appending the output of a command to a file (>>) works for me. Just replace my command for the alias command you need and enter it into your terminal.

  • The quoting here is slightly tricky. In this example, using double quotes is unproblematic, but if the text within the quotes contains dollar signs, backslashes, etc, you will need to understand how the shell processes them inside double quotes. You can switch to single quotes on the outside and double quotes on the inside, but you then still need to understand how Bash processes the double quotes in the alias definition. –  tripleee Nov 30 '15 at 6:04

I've made this little function for quickly writing a new-alias to .bashrc

##------------------------------------ ## # -- new-alias -- # # creates new alias & writes to file # # $1 = alias new # # $2 = alias definition # ##------------------------------------ ## new-alias () Twill Women's Black Women's Vans LPE Vans LPE Black Twill SUAwwn7q{ if [ -z "$1" ]; then echo "alias name:" read NAME else NAME=$1 fi if [ -z Casual Brun Boot Golden Men's Chukka Fox Enzo "$2" ]; then echo "alias definition:" read DEFINTION else if [ "$2" = "-cd" ]; then DEFINTION='cd ' else DEFINTION=$2 fi Men's Enzo Golden Fox Casual Chukka Boot Brun fi echo "alias $NAME='$DEFINTION'" >> ~/.bashrc . ~/.bashrc }
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  • Good idea, but careless using of this function may lead to trashing .bashrc with multiple instances of alias command. Your function definitely needs to implement some checkups to avoid such cluttering. –  Troublemaker-DV Mar 31 '16 at 1:04

if you are using ruby, you can install aka using rubygem.

gem install aka2

usage

aka generate hello="echo helloworld" #add an alias aka g hello="echo helloworld" #add alias for lazy people aka destroy hello #remove alias aka d hello #remove alias for lazy people

the rubygem will auto-source your dot file so that you don't need to. Check it out.

I would suggest using /etc/bash.bashrc

You can add line at the end of that file.

alias ok="ping google.com"

After putting the aliases per line you have to reboot or relogin.

  • 7
    "I would suggest .." and why would you suggest that? –  muru Aug 9 '15 at 4:17
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    You should not be messing with the system file unless you specifically want to install a system-wide setting for all users. On a personal system, the difference is marginal, but then messing with system files is more complicated down the road, so you should probably still prefer your own personal dot files for personal preferences (and that makes it easier to copy the settings somewhere else in the future, too). –  tripleee Nov 30 '15 at 6:06
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  • Reboot? That's really terrible advice, DON'T do that, especially when source /etc/bash.bashrc does all you want in this example. But should use ~/.bashrc or ~/.bash_aliases instead –  Xen2050 Jan 18 at 12:50
  • @Xen2050 , I suggested reboot to show it works after reboot/relogin. By the way, even another clean terminal window will also work. –  Fahad Ahammed Jan 19 at 15:52
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    You can upgrade to a new kernel without rebooting, this ain't old windows ;-) –  Xen2050 Jan 19 at 15:54

protected by heemayl Aug 14 '15 at 18:22

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