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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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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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