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Full Discussion: How do display a warning message?
Top Forums Shell Programming and Scripting How do display a warning message? Post 302407414 by dunkar70 on Thursday 25th of March 2010 10:56:01 AM
Old 03-25-2010
To create a custom error message, you may need to test for the error situation and catch it before the system does. Someone else may have a trick to catch system errors and redirect the output. For example,

You can wrap the test in a function (see example 1 below) within an existing script or you can create a separate script (see example 2 below). In the latter case, you can call the script (i.e. mycd) instead of the cd function. Don't forget to set the execute bit on the file.

Example 1. Function:
Code:
function checkDirectory()
{
_directory=$1
if [ -d $_directory ]; then
  cd $_directory
else
  echo "The directory you entered (${_directory}) does not exist."
  echo "Please check your directory and try again."
fi
}

Example 2. Separate Script:
Code:
#!/bin/bash
# Script Name: mycd
_directory=$1
if [ -d $_directory ]; then
  cd $_directory
else
  echo "The directory you entered (${_directory}) does not exist."
  echo "Please check your directory and try again."
fi

As for the word count, perhaps if you explain the problem (what do you need to see) rather than the solution (that is not working) we can provide a better way. Word counts of directory listings seems strange to me, but there may be a valid reason.
 

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LEARN ABOUT MOJAVE

pcap_activate

PCAP_ACTIVATE(3PCAP)													      PCAP_ACTIVATE(3PCAP)

NAME

       pcap_activate - activate a capture handle

SYNOPSIS

       #include <pcap/pcap.h>

       int pcap_activate(pcap_t *p);

DESCRIPTION

       pcap_activate() is used to activate a packet capture handle to look at packets on the network, with the options that were set on the handle
       being in effect.

RETURN VALUE

       pcap_activate() returns 0 on success without warnings, a non-zero positive value on success with warnings, and a negative value	on  error.
       A non-zero return value indicates what warning or error condition occurred.

       The possible warning values are:

       PCAP_WARNING_PROMISC_NOTSUP
	      Promiscuous mode was requested, but the capture source doesn't support promiscuous mode.

       PCAP_WARNING_TSTAMP_TYPE_NOTSUP
	      The  time  stamp type specified in a previous pcap_set_tstamp_type() call isn't supported by the capture source (the time stamp type
	      is left as the default),

       PCAP_WARNING
	      Another warning condition occurred; pcap_geterr() or pcap_perror() may be called with p as an argument to fetch or display a message
	      describing the warning condition.

       The possible error values are:

       PCAP_ERROR_ACTIVATED
	      The handle has already been activated.

       PCAP_ERROR_NO_SUCH_DEVICE
	      The capture source specified when the handle was created doesn't exist.

       PCAP_ERROR_PERM_DENIED
	      The process doesn't have permission to open the capture source.

       PCAP_ERROR_PROMISC_PERM_DENIED
	      The process has permission to open the capture source but doesn't have permission to put it into promiscuous mode.

       PCAP_ERROR_RFMON_NOTSUP
	      Monitor mode was specified but the capture source doesn't support monitor mode.

       PCAP_ERROR_IFACE_NOT_UP
	      The capture source device is not up.

       PCAP_ERROR
	      Another error occurred.  pcap_geterr() or pcap_perror() may be called with p as an argument to fetch or display a message describing
	      the error.

       If PCAP_WARNING_PROMISC_NOTSUP, PCAP_ERROR_NO_SUCH_DEVICE, or PCAP_ERROR_PERM_DENIED is returned, pcap_geterr()	or  pcap_perror()  may	be
       called  with p as an argument to fetch or display an message giving additional details about the problem that might be useful for debugging
       the problem if it's unexpected.

       Additional warning and error codes may be added in the future; a program should check for positive, negative, and zero  return  codes,  and
       treat  all  positive return codes as warnings and all negative return codes as errors.  pcap_statustostr() can be called, with a warning or
       error code as an argument, to fetch a message describing the warning or error code.

SEE ALSO

       pcap(3PCAP)

								   7 April 2014 					      PCAP_ACTIVATE(3PCAP)
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