02-22-2006
It varies by shell, but basically the set command is used to define a variable for the current shell. The export command is used to define the variable as one that subshells (shells spawned from the original) should inherit.
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I never undestood exactly what's the difference between the SET and SETENV commands.
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Can anyone please explain what the difference is between these two commands
typeset - ?
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http://cnswww.cns.cwru.edu/~chet/bash/bashref.html#SEC58
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"
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asadmin-unset(1AS) User Commands asadmin-unset(1AS)
NAME
asadmin-unset, unset - removes one or more variables from the multimode environment
SYNOPSIS
unset env_var [env_var]*
Removes one or more variables you set for the multimode environment. The variables and their associated values will no longer exist in the
environment.
OPERANDS
env_var environment variable to be removed.
Example 1: Using unset to remove environment variables
asadmin> export AS_ADMIN_HOST=bluestar AS_ADMIN_PORT=8000 AS_ADMIN_USER=admin AS_ADMIN_PASSWORD=password
asadmin> export AS_ADMIN_PREFIX=server1.jms-service
asadmin> export
AS_ADMIN_HOST=bluestar
AS_ADMIN_PORT=8000
AS_ADMIN_USER=admin
AS_ADMIN_PASSWORD=********
AS_ADMIN_PREFIX=server1.jms-service
asadmin> unset AS_ADMIN_PREFIX
asadmin> export
AS_ADMIN_HOST=bluestar
AS_ADMIN_PORT=8000
AS_ADMIN_USER=admin
AS_ADMIN_PASSWORD=********
Using the export command without the argument lists the environment variables that are set. Notice the AS_ADMIN_PREFIX is not in the envi-
ronment after running the unset command.
EXIT STATUS
0 command executed successfully
1 error in executing the command
asadmin-export(1AS), asadmin-multimode(1AS)
J2EE 1.4 SDK March 2004 asadmin-unset(1AS)