I use Bash as my interactive shell and I was wondering if there was an easy way to get Bash to run a system command instead of a shell builtin command in the case where they both share the same name.
After reading ilkkachu’s answer to this question I learned on the existence of the declare (with argument -n) shell built in.
If I execute the test command in bash, test(evaluates conditional expression) built-in utility is started:
I want to customize the functionality of cd command as per my needs.
Typing man alias gives me
env and printenv are both external commands i.e. executable files, not bash builtins.
The problem with them is that some environment variables (such as _, and I also wonder if there are more) which they output don’t belong to the shell which invokes them, see here.
The yash shell has a printf built-in, according to its manual.
Some commands are provided as both builtins and external utilities. Take echo for example. On my machine (macOS) running Bash 3.2,
eval and exec are both built in commands of bash(1) that execute commands.
Consider this from the documentation of Bash’ builtin exec: