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Top Forums Shell Programming and Scripting File exists, but cannot be opened.How to check- whether it could be opened to read when it exists Post 302638657 by rxg on Thursday 10th of May 2012 01:57:24 PM
Old 05-10-2012
File exists, but cannot be opened.How to check- whether it could be opened to read when it exists

Hi

Code:
#Testing for  file existence 
if [ -f $DIR/SCHOOL_FAC.txt ]; then   
  echo 'SCHOOL data is available for processing'   
else   
  echo 'SCHOOL DATA IS NOT AVAILABLE FOR PROCESSING'  
  :

i wrote a script, where it begins by checking if file exists or not.
If it exists, it truncates the database table and bcp's new data from file into the table.

Now, I had a situtation, where the file exists, but couldnot open,
and since my above statements checks for file existence, the database table is truncated and the table became empty.
When tried to bcp the file...the file couldnot be opened and it failed.

Now the database table lost its old data and since file couldnot be opened, the bcp couldnot load data into the table.

How can i check whether file is readable,so that i can take of truncating the table only when the file is readable and can be opened.

Any answer is appreciated, with respect to my above problem.

Thank You.Smilie
 

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datacopy(1)							 FreeTDS Utilities						       datacopy(1)

NAME
datacopy - move table data between two servers SYNOPSIS
datacopy { -t | -a | -c owner } [-b batchsize] [-p packetsize] [-v] [-d] [-S server/username/password/database/table_or_view] [-D server/username/password/database/table] DESCRIPTION
datacopy is a utility distributed with FreeTDS. datacopy will move table data from one server to another without the need for intermediate files. datacopy is much faster and more efficient than is freebcp out/in. datacopy makes use of the db-lib bcp API built into FreeTDS. This API is also available to application developers. datacopy can be used to migrate data between Sybase ASE and SQL Server or vice versa. OPTIONS
-t Truncate target table before loading data. -a Append data to target table. -c owner Create the target table with the same schema as the source table. datacopy will submit a 'create table' command on the target server/database using the specified owner in the command, e.g. CREATE TABLE owner.table (...). -b batchsize The number of rows per batch of data copied. Each batch of data is effectively 'committed' to the database. The default is 1000. -p packetsize The number of bytes, per network packet, sent to and from the servers. Increased packet size can enhance performance. -v Produce verbose output, including diagnostic timings. -d Produce freetds TDSDUMP output. (Serious debug only!) -S server/username/password/database/table_or_view The connection information for the source server and the location/name of the table (or view) to be copied. If not specified, data- copy will prompt the user for the information. -D server/username/password/database/table The connection information for the destination server and the location/name of the target table. If not specified, datacopy will prompt the user for the information. SEE ALSO
freebcp(1), defncopy(1), bsqldb(1), tsql(1), FreeTDS User Guide. HISTORY
datacopy first appeared in FreeTDS 0.64. AUTHORS
The datacopy utility was written by Bill Thompson (thompbil@exchange.uk.ml.com). doc 13 November 2011 datacopy(1)
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