z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

Portability
v The command line had an incorrect number of options
POSIX.2 User Portability Extension, X/Open Portability Guide, UNIX systems.
Related Information
mailx, mesg, talk, who
writedown — Set or display user’s write-down mode
Format
Description
Options
Usage notes
Exit Values
writedown –a | –d | –i [–p]
writedown –p
writedown sets or displays the user’s write-down mode for the current address
space. Setting or querying the write-down mode is only allowed if multilevel security
is active and the user has ″write-down″ privilege. See z/OS Planning for Multilevel
Security and the Common Criteria for more information on multilevel security.
–a Activate write-down mode. This allows the user to write data to a resource
protected by an multilevel security label of lower labeled classification than
the user’s seclabel.
–d Set the write-down mode from the default value in the user’s security
profile.
–i Inactivate write-down mode. This prevents the user from writing data to a
resource protected by a multilevel security seclabel of lower labeled
classification than the user’s seclabel.
–p Print the user’s current write-down mode setting to stdout. The output is
″active″ or ″inactive″. If used with –a, –d, or –i, the new value is displayed.
1. This command is only supported when the user has at least READ access to
the IRR.WRITEDOWN.BYUSER resource in the FACILITY class and SETR
MLS is active.
2. Write-down mode affects the current process’ address space. When the
write-down mode is changed, all processes running in the same address space
will get the new write-down setting, until the shell (where writedown was
invoked) exits.
3. writedown is a built-in shell command in sh and tcsh. It affects the security
setting for commands issued by the current shell, and by child processes, such
as shell scripts.
4. See z/OS Planning for Multilevel Security and the Common Criteria for more
information about write-down mode, multilevel security, and seclabels.
The exit values for /bin/sh are as follows:
0 Successful completion
write
Chapter 2. Shell command descriptions 795