Re: [gentoo-catalyst] [PATCH 5/6] ln,echo and cp commands concentration

[Mike Frysinger]

On 12 Apr 2017 11:43, Christos Kotsi wrote:
>  # Tweak the livecd make.conf so that users know not to edit it
>  # https://bugs.gentoo.org/144647
> -mv ${clst_make_conf} ${clst_make_conf}.old
> -echo "####################################################" >> ${clst_make_conf}
> -echo "## ATTENTION: THIS IS THE MAKE.CONF ON THE LIVECD ##" >> ${clst_make_conf}
> -echo "## PLEASE EDIT /mnt/gentoo${clst_make_conf} INSTEAD  ##" >> ${clst_make_conf}
> -echo "####################################################" >> ${clst_make_conf}
> -cat ${clst_make_conf}.old >> ${clst_make_conf}
> -
> +echo -e "####################################################\n$(cat ${clst_make_conf})" > ${clst_make_conf}
> +echo -e "## PLEASE EDIT /mnt/gentoo${clst_make_conf} INSTEAD		  ##\n$(cat ${clst_make_conf})" > ${clst_make_conf}
> +echo -e "## ATTENTION: THIS IS THE MAKE.CONF ON THE LIVECD ##\n$(cat ${clst_make_conf})" > ${clst_make_conf}
> +echo -e "####################################################\n$(cat ${clst_make_conf})" > ${clst_make_conf}

this is not an improvement:
- the constant cat at the end is ugly
- use of `echo -e` is discouraged
- you've incorrectly changed some things to tabs

you could write it instead:
old_conf=$(cat "${clst_make_conf}")
(
  echo ...all...
  echo ...the...
  echo ...things...
  echo "${old_conf}"
) > "${clst_make_conf}"
-mike