timeout dating new york - Updating a file using random access

Legacy (pre-November 2016) AMIs use the legacy EC2Config service.The EC2Config service performs initialization tasks during instance launch and processes SSM requests on Windows instances.Windows AMIs include an optional service called the EC2Config service (EC2Config.exe).

updating a file using random access-77

use Fcntl; # for SEEK_SET and SEEK_CUR $ADDRESS = $RECSIZE * $RECNO; seek(FH, $ADDRESS, SEEK_SET) or die "Seeking: $!

"; read(FH, $BUFFER, $RECSIZE) == $RECSIZE or die "Reading: $!

If you attempt to execute commands using SSM features released after November 2016, the commands fail because SSM features developed after November 2016 must be processed by SSM Agent, not the EC2Config service.

To avoid errors, upgrade EC2Config using Run Command.

Acct# First Name Last Name Balance 0 "" "" 0.0 0 "" "" 0.0 0 "" "" 0.0 05 Joe Costanza 0.50 0 "" "" 0.0 0 "" "" 0.0 0 "" "" 0.0 19 Jason Bourne 58.00 0 "" "" 0.0 0 "" "" 0.0 42 Andy Der -15.12 0 "" "" 0.0 0 "" "" 0.0 I want to subtract an amount from balance from all the records that have a non zero account number and write the new updated balance to the file for those records.

This is what I have tried so far to accomplish the above.

EC2Config performs all of the tasks described earlier and SSM Agent processes requests for Run Command and SSM Config.

The following table describes how this change affects different components and configurations.

Once you have a file object that is correctly opened (i.e., for update, and as a binary rather than a text file), you can perform as many updates on the file as you want before closing the file again.

These calls are shown here to emphasize the proper technique for opening a file for random-access updates and the importance of closing a file when you are done with it.

cf Ptr = fopen("credit.dat", "rb "); fread(&client, sizeof(struct client Data), 1, cf Ptr); client.balance -= service Charge; fseek(cf Ptr,(Num - 1) * sizeof(struct client Data), SEEK_CUR); fwrite(&client, sizeof(struct client Data), 1, cf Ptr); I will assume that error checking on the function return values is 'not needed'; it should be there, but it will complicate things slightly.

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