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Full Discussion: How do we display specific row of an output from bottom given line number?
Top Forums Shell Programming and Scripting How do we display specific row of an output from bottom given line number? Post 303043995 by vbe on Wednesday 12th of February 2020 09:09:28 AM
Old 02-12-2020
OK what have you done so far?

As we agree the first code you gave in #1 wont take you very far...

Passing numbers, OK but what if its not the case? like char or words, what happens?

Writing a script that accepts arguments is something nice, but unless its for your own usage, it should be fool proof and properly written Like :

No argument -> display usage

Testing the argument values etc...
Last edited by Neo; 02-12-2020 at 11:58 AM..
 

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LEARN ABOUT DEBIAN

mode_e_driver_cntls

Attributes and Cntls(3) 					    globus xio						   Attributes and Cntls(3)

NAME

       Attributes and Cntls -

   Enumerations
       enum globus_xio_mode_e_cmd_t { GLOBUS_XIO_MODE_E_SET_STACK, GLOBUS_XIO_MODE_E_GET_STACK, GLOBUS_XIO_MODE_E_SET_NUM_STREAMS,
	   GLOBUS_XIO_MODE_E_GET_NUM_STREAMS, GLOBUS_XIO_MODE_E_SET_OFFSET_READS, GLOBUS_XIO_MODE_E_GET_OFFSET_READS,
	   GLOBUS_XIO_MODE_E_SET_MANUAL_EODC, GLOBUS_XIO_MODE_E_GET_MANUAL_EODC, GLOBUS_XIO_MODE_E_SEND_EOD, GLOBUS_XIO_MODE_E_SET_EODC,
	   GLOBUS_XIO_MODE_E_DD_GET_OFFSET, GLOBUS_XIO_MODE_E_SET_STACK_ATTR, GLOBUS_XIO_MODE_E_GET_STACK_ATTR }

   Functions
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_STACK, globus_xio_stack_t stack)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_STACK, globus_xio_stack_t *stack_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_NUM_STREAMS, int num_streams)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_NUM_STREAMS, int *num_streams_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_OFFSET_READS, globus_bool_t offset_reads)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_OFFSET_READS, globus_bool_t *offset_reads_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_MANUAL_EODC, globus_bool_t manual_eodc)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_MANUAL_EODC, globus_bool_t *manual_eodc_out)
       globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_MODE_E_SEND_EOD, globus_bool_t send_eod)
       globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_MODE_E_SET_EODC, int eod_count)
       globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_MODE_E_DD_GET_OFFSET, globus_off_t *offset_out)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_STACK_ATTR, globus_xio_stack_t stack)
       globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_STACK_ATTR, globus_xio_attr_t *stack_out)

Detailed Description
       Mode_e driver specific attrs and cntls.

       See also:
	   globus_xio_attr_cntl()

	   globus_xio_handle_cntl()

	   globus_xio_server_cntl()

	   globus_xio_data_descriptor_cntl()

Enumeration Type Documentation
   enum globus_xio_mode_e_cmd_t
       doxygen varargs filter stuff MODE_E driver specific cntls

       Enumerator:

       GLOBUS_XIO_MODE_E_SET_STACK
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_GET_STACK
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_SET_NUM_STREAMS
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_GET_NUM_STREAMS
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_SET_OFFSET_READS
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_GET_OFFSET_READS
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_SET_MANUAL_EODC
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_GET_MANUAL_EODC
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_SEND_EOD
	      See usage for: globus_xio_data_descriptor_cntl .

       GLOBUS_XIO_MODE_E_SET_EODC
	      See usage for: globus_xio_handle_cntl .

       GLOBUS_XIO_MODE_E_DD_GET_OFFSET
	      See usage for: globus_xio_data_descriptor_cntl .

       GLOBUS_XIO_MODE_E_SET_STACK_ATTR
	      See usage for: globus_xio_attr_cntl .

       GLOBUS_XIO_MODE_E_GET_STACK_ATTR
	      See usage for: globus_xio_attr_cntl .

Function Documentation
   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_STACK, globus_xio_stack_tstack)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set the stack (of xio drivers) to be used for the connection(s). Do not create a new ftp client handle, use this handle instead.

       Parameters:
	   stack Specifies the stack to use for the connection(s). Note: this stack will not be destroyed.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_STACK, globus_xio_stack_t *stack_out)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Get the stack on the attr. Parameters:
	   stack_out The stack will be stored here. If none is set, GLOBUS_NULL will be set.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_NUM_STREAMS, intnum_streams)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set the number of streams to be used between the client and the server. Parameters:
	   num_streams Specifies the number of streams to use.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_NUM_STREAMS, int *num_streams_out)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Get the number of streams on the attr. Parameters:
	   num_streams_out The stream count will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_OFFSET_READS, globus_bool_toffset_reads)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set flag to indicate whether the data read from user would always be preceded by an offset read or not. The user can do a read with
       wait_for_bytes set to zero, to find the offset of the data that he is going to get in his next read operation

       Parameters:
	   offset_reads GLOBUS_TRUE to enable offset reads, GLOBUS_FALSE to disable offset reads (default).

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_OFFSET_READS, globus_bool_t *offset_reads_out)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Get OFFSET_READS flag on the attr. Parameters:
	   offset_reads_out The OFFSET_READS flag will be stored here.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_MANUAL_EODC, globus_bool_tmanual_eodc)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set flag to indicate whether EODC will be set manually by the user on a data_desc or the driver has to calculate the EODC. Parameters:
	   manual_eodc GLOBUS_TRUE to set EODC manually, GLOBUS_FALSE to not set EODC manually (default).

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_MANUAL_EODC, globus_bool_t *manual_eodc_out)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Get MANUAL_EODC flag on the attr. Parameters:
	   manual_eodc_out The MANUAL_EODC flag will be stored here.

   globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_MODE_E_SEND_EOD, globus_bool_tsend_eod)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set SEND_EOD flag

       Used only for data descriptors to write calls. Parameters:
	   send_eod GLOBUS_TRUE to send EOD, GLOBUS_FALSE to not send EOD (default).

   globus_result_t globus_xio_handle_cntl (handle, driver, GLOBUS_XIO_MODE_E_SET_EODC, inteod_count)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set EOD count

       Used only if MANUAL_EODC flag is set to GLOBUS_TRUE. Parameters:
	   eod_count specifies the eod count

   globus_result_t globus_xio_data_descriptor_cntl (dd, driver, GLOBUS_XIO_MODE_E_DD_GET_OFFSET, globus_off_t *offset_out)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Get offset of the next available data

       Used only if OFFSET_READS is enabled. Parameters:
	   offset_out offset will be stored here

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_SET_STACK_ATTR, globus_xio_stack_tstack)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Set the attr to be used with the stack set from GLOBUS_XIO_MODE_E_SET_STACK. Do not create a new ftp client handle, use this handle
       instead.

       Parameters:
	   stack Specifies the stack to use for the connection(s). Note: this stack will not be destroyed.

   globus_result_t globus_xio_attr_cntl (attr, driver, GLOBUS_XIO_MODE_E_GET_STACK_ATTR, globus_xio_attr_t *stack_out)
       This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
       Get the attr that will be used with the stack. This is intended for use with GLOBUS_XIO_MODE_E_SET_STACK.

       Parameters:
	   stack_out The stack will be stored here. If none is set, GLOBUS_NULL will be set.

Author
       Generated automatically by Doxygen for globus xio from the source code.

Version 3.3							  Mon Apr 30 2012					   Attributes and Cntls(3)
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