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I want to use some aliases in a non-interactive shell, after reading this post and this post. Here is my command:

bash -O expand_aliases -c 'source ~/.bashrc; <some alias>'

and here is my .bashrc:

 # Bash History
 HISTSIZE=1000
 HISTFILESIZE=2000
 # Colorful Prompt
 PS1='\[\033[01;34m\]\w\n\[\033[01;32m\]\u@\h\[\033[00m\] > '
 # Aliases
 alias ls='ls --color=auto -A -I NTUSER.\* -I ntuser.\*'
 alias echo='echo -e'
 alias docker='"/mnt/c/Program Files/Docker/Docker/resources/bin/docker.exe"'
 alias docker-compose='"/mnt/c/Program Files/Docker/Docker/resources/bin/docker-compose.exe"'

I echoed something in .bashrc and am sure that source ~/.bashrc worked, but the aliases just refused to expand. I also tried:

bash -O expand_aliases -c shopt

to ensure that the option expand_aliases is set to on.

How do I fix this?

2 Answers 2

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The very simple workaround is to use a function instead of an alias. There are many situations where functions are superior to aliases, and as far as I can tell none where the opposite is true.

 docker () { "/mnt/c/Program Files/Docker/Docker/resources/bin/docker.exe" "$@"; }
 docker-compose () { "/mnt/c/Program Files/Docker/Docker/resources/bin/docker-compose.exe" "$@"; }

(I have refused to port your ls and echo aliases - they seem more harm than good.)

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The .bashrc is executed for interactive shells only.

This is what I've done. Create a new file .bash_env in your home directory. Put all your aliases there, e.g.:

shopt -s expand_aliases
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'
alias grep='grep --color=auto'
alias ll='ls -l --color=auto'
alias ls='ls --color=auto'
alias vi='vim'

Then reference it in your .bash_profile (put a real pathname there, of course):

 export BASH_ENV='/home/username/.bash_env'

(Log out and log in to activate)


BASH_ENV in the manpage:

If this parameter is set when bash is executing a shell script, its value is interpreted as a filename containing commands to initialize the shell, as in ~/.bashrc.

and:

When bash is started non-interactively, to run a shell script, for example, it looks for the variable BASH_ENV in the environment, expands its value if it appears there, and uses the expanded value as the name of a file to read and execute.

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