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Full Discussion: PERL error handling
Top Forums Shell Programming and Scripting PERL error handling Post 302551731 by jim mcnamara on Wednesday 31st of August 2011 11:45:07 AM
Old 08-31-2011
Well you should consider dos2unix (may br dos2ux on your box) to clean up windows carriage returns. It was meant to do that. And has error handling.

Otherwise, you have to do error handling inside the perl script itself.
You can add external checks:
Code:
# note: this is kind of generalized for basic file I/O checking, and is overkill for this particular perl one liner.
if [ -r TR_TMP_$4 ] ; then
   touch $4 ||  echo "cannot write $4" && exit
   perl -p -e 's/\n/\r\n/g' < TR_TMP_$4 > $4
   if [ $? -ne 0 ] ; then
      echo "fatal error "
      exit
   fi
else
   echo "cannot read TR_TMP_$4"
   exit
fi

Note: consider forming TR_TMP_$4 as TR_TMP_${4} It is two more keystrokes but if you do it consistently it will save ambiguity in reading code, and has helped me catch mistakes lots faster. YMMV.

Last edited by jim mcnamara; 08-31-2011 at 01:00 PM..
 

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MYSQL_FETCH_ASSOC(3)							 1						      MYSQL_FETCH_ASSOC(3)

mysql_fetch_assoc - Fetch a result row as an associative array

SYNOPSIS
Warning This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include: omysqli_fetch_assoc(3) o PDOStatement::fetch array mysql_fetch_assoc (resource $result) DESCRIPTION
Returns an associative array that corresponds to the fetched row and moves the internal data pointer ahead. mysql_fetch_assoc(3) is equiv- alent to calling mysql_fetch_array(3) with MYSQL_ASSOC for the optional second parameter. It only returns an associative array. o $ result -The result resource that is being evaluated. This result comes from a call to mysql_query(3). Returns an associative array of strings that corresponds to the fetched row, or FALSE if there are no more rows. If two or more columns of the result have the same field names, the last column will take precedence. To access the other column(s) of the same name, you either need to access the result with numeric indices by using mysql_fetch_row(3) or add alias names. See the example at the mysql_fetch_array(3) description about aliases. Example #1 An expanded mysql_fetch_assoc(3) example <?php $conn = mysql_connect("localhost", "mysql_user", "mysql_password"); if (!$conn) { echo "Unable to connect to DB: " . mysql_error(); exit; } if (!mysql_select_db("mydbname")) { echo "Unable to select mydbname: " . mysql_error(); exit; } $sql = "SELECT id as userid, fullname, userstatus FROM sometable WHERE userstatus = 1"; $result = mysql_query($sql); if (!$result) { echo "Could not successfully run query ($sql) from DB: " . mysql_error(); exit; } if (mysql_num_rows($result) == 0) { echo "No rows found, nothing to print so am exiting"; exit; } // While a row of data exists, put that row in $row as an associative array // Note: If you're expecting just one row, no need to use a loop // Note: If you put extract($row); inside the following loop, you'll // then create $userid, $fullname, and $userstatus while ($row = mysql_fetch_assoc($result)) { echo $row["userid"]; echo $row["fullname"]; echo $row["userstatus"]; } mysql_free_result($result); ?> Note Performance An important thing to note is that using mysql_fetch_assoc(3) is not significantly slower than using mysql_fetch_row(3), while it provides a significant added value. Note Field names returned by this function are case-sensitive. Note This function sets NULL fields to the PHP NULL value. mysql_fetch_row(3), mysql_fetch_array(3), mysql_data_seek(3), mysql_query(3), mysql_error(3). PHP Documentation Group MYSQL_FETCH_ASSOC(3)
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