org.apache.hadoop.util.Shell
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## Class org.apache.hadoop.util.`Shell`

Removed Methods
`String[]` `getGROUPS_COMMAND`() | a Unix command to get the current user's groups list
`String[]` `getUlimitMemoryCommand`(`Configuration`) | Get the Unix command for setting the maximum virtual memory available to a given child process.

Added Methods
`String` `execCommand`(`Map,` String[], long) | Static method to execute a shell command.
`String[]` `getGroupsCommand`() | a Unix command to get the current user's groups list
`String[]` `getGroupsForUserCommand`(`String`) | a Unix command to get a given user's groups list
`String[]` `getUlimitMemoryCommand`(`int`) | Get the Unix command for setting the maximum virtual memory available to a given child process.
`String[]` `getUlimitMemoryCommand`(`Configuration`) | Get the Unix command for setting the maximum virtual memory available to a given child process.
`boolean` `isTimedOut`() | To check if the passed script to shell command executor timed out or not.

Added Fields
`String` `ULIMIT_COMMAND` | a Unix command to get ulimit of a process.
`long` `timeOutInterval` | Time after which the executing script would be timedout

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