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Understanding shell variables z/OS UNIX System Services User's Guide SA23-2279-00 |
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You can display the shell's variables and their values by entering
this command:
You
may see many variables that you don't recognize. These are built-in,
or predefined, variables that are set up with default values
when you start the shell.You can customize the built-in variables by setting their value in your .profile. Only the variables IFS, PS1, and PS2 support double-byte characters for the values. Only the shell variables that are exported are available to shell scripts and commands invoked from the shell. Environment variables are a subset of shell variables that have been exported. You can display the environment variables and their values by entering
either of these commands:
You can display the value of a single variable with the echo command,
the print command, or the printenv command. For example, any of these commands
displays the current value of the HOME variable.In general, echo displays the current
values of all its arguments, after any shell processing has taken
place. For example, consider:
The
shell first expands the wildcard character *.
This produces the names of every file in the working directory that
has the suffix .doc. So the output of echo is
a list of all such files. And if there are no file names ending in .doc,
the command output is just *.doc.For more information about shell variables,
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Copyright IBM Corporation 1990, 2014
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