Issue
I need to port a short script from bash to dash (i.e. sh under Debian 10). It contains the following line:
chown root:www-data /etc/nginx/conf.d && chmod 775 $_
This now fails because $_ held the previous command's last argument (i.e. /etc/nginx/conf.d) with bash but now holds a different value with non-interactive dash. As another case in point, outputs from bash -c 'echo 1 2 && echo $_' and dash -c 'echo 1 2 && echo $_' also differ.
What is a typical way for forming "concise" statements of the above type in dash (without resorting to more specialized commands, such as install)?
Solution
Just write a function.
chownmod () { chown "$1" "$3" && chmod "$2" "$3"; }
And replace the line with the following.
chownmod root:www-data 775 /etc/nginx/conf.d
Answered By - ceving Answer Checked By - Dawn Plyler (WPSolving Volunteer)