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

Messages
Portability
Related Information
ed, let, sh, test
v Command-line syntax error.
v Too few arguments on the command line.
v Incorrect regular expression.
v Regular expression is too complicated.
v Nonnumeric value found where a number was expected.
Possible error messages include:
internal tree error
Syntax errors or unusual expression complexity make it impossible for expr
to evaluate an expression. If an expression has syntax errors, correct them;
if not, simplify the expression (perhaps by breaking it into parts).
POSIX.2, X/Open Portability Guide, UNIX systems.
In the shell, let largely supersedes this command.
match, substr, length, and index are not documented on all UNIX systems,
though they do appear to exist. They are extensions of the POSIX standard.
See Appendix C for more information about regexp.
exrecover daemon — Retrieve vi and ex files
Format
Description
Options
exrecover [–s] [name_file ...]
exrecover [–v]
The exrecover daemon recovers text files from working files created by vi and ex.
(These working files are in one or more temporary directories.) It is normally
invoked from a system startup file before these working files are purged.
–s Suppresses error messages.
–v Displays the version number of exrecover.
Environment Variables
exrecover uses the following environment variables:
expr
TMP_VI
Contains a directory pathname that can be specified by an administrator as
a location for vi temporary files. This is useful if the current default directory
for these files (usually /tmp) is implemented as a TFS. In this case, all vi
temporary files that the exrecover daemon uses for recovery would be
gone after a system crash.
Chapter 2. Shell command descriptions 267