improve compatibility with FreeBSD

[themarek]

It is related to this bug report: opnsense/plugins#3525

FreeBSD's sed doesn't have the -z option, so empty certificates are delivered to vault when running the script on FreeBSD.

[Neilpang]

can you please try with:

_ckey=$(tr '\n' '\\n' <"$2")

[themarek]

Thank you for the suggestion!
It doesn't work :(

OPNsense:~ # printf "ab\ncd\n"
ab
cd

OPNsense:~ # printf "ab\ncd\n" | awk '{printf "%s\\n",$0}'
ab\ncd\n

OPNsense:~ # printf "ab\ncd\n" | tr '\n' '\\n'
ab\cd\


ubuntu:~ # printf "ab\ncd\n" | awk '{printf "%s\\n",$0}'
ab\ncd\n

ubuntu:~ # printf "ab\ncd\n" | tr '\n' '\\n'
ab\cd\


macos:~ # printf "ab\ncd\n" | awk '{printf "%s\\n",$0}'
ab\ncd\n

macos:~ # printf "ab\ncd\n" | tr '\n' '\\n'
ab\cd\

[themarek]

@Neilpang Can I provide more information to support the merge? :-)

[Neilpang]

can you implement without awk ?

[themarek]

@Neilpang I changed it to a version with sed.