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https://issues.apache.org/jira/browse/HADOOP-7089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978117#action_12978117
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Greg Roelofs commented on HADOOP-7089:
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...and looks like older versions of GNU readlink don't accept the -m option.
This is the --help output from version 5.2.1:
-f, --canonicalize canonicalize by following every symlink in every
component of the given path recursively
-n, --no-newline do not output the trailing newline
-q, --quiet,
-s, --silent suppress most error messages
-v, --verbose report error messages
--help display this help and exit
--version output version information and exit
> Use readlink to get absolute paths in the scripts
> --------------------------------------------------
>
> Key: HADOOP-7089
> URL: https://issues.apache.org/jira/browse/HADOOP-7089
> Project: Hadoop Common
> Issue Type: Improvement
> Components: scripts
> Reporter: Eli Collins
> Assignee: Eli Collins
> Priority: Minor
> Fix For: 0.22.0, 0.23.0
>
> Attachments: hadoop-7089-1.patch, hadoop-7089-1.patch
>
>
> The manual link resolution logic in bin/hadoop-config.sh can be replaced with
> readlink -m -n. Ditto with other uses of cd + pwd to get an absolute path,
> which can be fragile.
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