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

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Localization
Exit Values
Portability
_UNIX03
For more information about the effect of _UNIX03 on this command, see
Appendix N, “UNIX shell commands changed for UNIX03,” on page 943.
tr uses the following localization environment variables:
v LANG
v LC_ALL
v LC_COLLATE
v LC_CTYPE
v LC_MESSAGES
v LC_SYNTAX
v NLSPATH
See Appendix F for more information.
0 Successful completion
1 Failure because of unknown command line option, or too few arguments
POSIX.2, X/Open Portability Guide.
tr is downward–compatible with both the UNIX Version 7 and System V variants of
this command, but with extensions (C escapes, handles ASCII NUL,
internationalization).
trap — Intercept abnormal conditions and interrupts
Format
Description
trap [’handler’] [event ...]
trap intercepts certain kinds of exception conditions. Any signal may be intercepted
by specifying an event corresponding to the signal number.
With an event of ERR, trap invokes the handler after receiving any having a nonzero
exit status. The exception to this is conditions in if, while, and until statements.
This trap is not inherited within a function.
With a trap number of 0 or EXIT, trap invokes the handler during exit from the shell.
Within a function, it is invoked during exit from the function.
Any other event corresponds to a signal number or signal name. (See kill for a
table of valid signal numbers and their names.) If a signal is being ignored when
you enter the shell, the shell continues to ignore it without regard to any traps.
Because system initialization sets the value of the SIGIOERR signal to ignore, this
signal cannot be set by trap.
The handler argument is a command list. It is usually more than one word, and so
you must quote it to appear as a single argument. It is scanned when the trap
function is initially invoked. When the trap condition is raised, the shell scans the
Chapter 2. Shell command descriptions 707
tr