--filemode Option for isql and bcp

(UNIX only) The --filemode option allows you to set the file permissions for the files generated by isql (output file) and bcp (all generated files by bcp). --filemode takes precedence over any default permission settings for those files.

The --filemode <nnn> option allows users to specify a more relaxed permission setting than the default for some of the bcp and isql generated files.

For isql, setting relaxed file permissions using the --filemode <nnn> option affects the generated output file (-o option) and the redirected output from isql (using the 'go > filename' method). For example, to create an isql output file that must be readable and writable by the 'user', readable only by 'group' and not read/writable by 'other', the user can specify:
```
isql -U sa -P secret -o myoutput --filemode 640
```
For bcp, setting relaxed file permissions using the --filemode <nnn> option affects these generated bcp files:
- Data file (the file containing the bcp output data)
- Output file (using -o option)
- Format file (using -f option)
- Error file (using -e option)

See the ESD #4 section Stricter Permissions for Open Client and Open Server Files (UNIX only) for the default permission settings of all generated data and output files.