rexec error

root@linux root]# rexec -a  localhost -1 ls          
 Username at root-1: DOR
 linux-1: No such file or directory
 rexec: Error in rexec system call,
 rexec: (The following system error may itself be in error)
 rexec: Illegal seek

can you help me.

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The -1 following localhost isn't a valid option to rexec. Perhaps you meant to use:

rexec -a localhost ls -1

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