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https://issues.apache.org/jira/browse/KARAF-6254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16833341#comment-16833341
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ASF GitHub Bot commented on KARAF-6254:
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jbonofre commented on pull request #820: [KARAF-6254] Use backticks for command
substitution
URL: https://github.com/apache/karaf/pull/820
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> Karaf shell scripts don't work on Solaris 10
> --------------------------------------------
>
> Key: KARAF-6254
> URL: https://issues.apache.org/jira/browse/KARAF-6254
> Project: Karaf
> Issue Type: Bug
> Components: karaf
> Affects Versions: 4.2.5
> Environment: Solaris 10 x86-64 using default shell
> Reporter: Baptiste DA ROIT
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 4.3.0, 4.2.6
>
>
> Trying to launch Karaf from default shell (which, from what I uderstand, is
> Bourne Shell) on a Solaris 10 platform results in the following error:
> {code:sh}
> # ./karaf
> ./karaf: erreur de syntaxe ligne 30: `READLINK_EXISTS=$' inattendue\{code}
> {code}
> On an other hand, running Karaf shell scripts using another shell (as ksh)
> works fine:
> {code:sh}
> # ksh karaf
> {code}
> The following shell scripts are impacted: client, inc, shell, start, status,
> stop
> {code:sh}
> # ./client
> ./client: erreur de syntaxe ligne 30: `READLINK_EXISTS=$' inattendue
> # ./inc
> ./inc: erreur de syntaxe ligne 77: `MAX_FD_LIMIT=$' inattendue
> # ./shell
> ./shell: erreur de syntaxe ligne 30: `READLINK_EXISTS=$' inattendue
> # ./start
> ./start: erreur de syntaxe ligne 30: `READLINK_EXISTS=$' inattendue
> # ./status
> ./status: erreur de syntaxe ligne 30: `READLINK_EXISTS=$' inattendue
> # ./stop
> ./stop: erreur de syntaxe ligne 30: `READLINK_EXISTS=$' inattendue
> {code}
> This is because these shell scripts uses the *$()* syntax for command
> substitution, which is not compatible with some very oldest of
> non-POSIX-compatible bourne-shells (such as the default Shell of Solaris 10).
> To enhance the portability of these scripts, an alternative would be to use
> the legacy command substitution syntax *`...`*. Indeed, while the *$()*
> syntax is recommended as the way to go (mainly because it makes nesting
> command substitutions easier and allows better readibility), the backtick one
> is still valid, even providing better portability.
>
> Source: [Why is {{$(...)}} preferred over {{`...`}}
> (backticks)?|http://mywiki.wooledge.org/BashFAQ/082] at BashFAQ
> (!) Note that this issue can probably be linked to
> [KARAF-5190|https://issues.apache.org/jira/browse/KARAF-5190].
>
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