执行 shell 脚本时使用回显选项

Question

On mac OSX, I have this script:

#!/usr/local/bin/bash
echo -e "\e[41mError: Some error.\e[0m"

When I just run the echo -e... in a console, it prints the colored text "Error: Some error."

When executed as a script sh myscript.sh , it litterally prints the flag and the escape characters: -e "\e[41mError: Some error.\e[0m" .

When I add the script location to ~/.bash_profile and execute it as myscript.sh , it does work. But I need to be able execute it without adding it to my bash profile.

Edit: using printf works: printf "\e[41mError: Some error.\e[0m\n" .

Answer 1

when you run the shell with sh it runs in posix compatibility mode (ie as the bourne shell does)

bash is a successor to this shell, one of the features it adds is the -e switch to echo

in posix shell you don't need the -e, the escapes will be evaluated anyway

in bash you do, so if you want to run bash do so explicitly