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

col
Usage notes
Exit Values
Portability
See Appendix F for more information.
1. col ignores vertical motions that back up over the first line, so you may get
unexpected results if the first line contains superscripts.
2. Because –f allows escape sequences, it may cause unexpected results on
terminals.
0 Successful completion
1 Failure due to any of the following:
v Incorrect command-line option
v Insufficient memory
UNIX systems.
This implementation does not handle doublebyte characters.
: (colon) — Do nothing, successfully
Format
Description
Example
Usage notes
Localization
: [argument ...]
tcsh shell: :
The : (colon) command is used when a command is needed, as in the then
condition of an if command, but nothing is to be done by the command. This
command simply yields an exit status of zero (success). This can be useful, for
example, when you are evaluating shell expressions for their side effects.
: (colon) in the tcsh shell
Performs as indicated for the z/OS version of : (colon).
: ${VAR:="default value"}
sets VAR to a default value if and only if it is not already set.
colon is a special built-in shell command.
colon uses the following localization environment variables:
v LANG
v LC_ALL
v LC_MESSAGES
v NLSPATH
See Appendix F for more information.
140 z/OS V1R9.0 UNIX System Services Command Reference