The difference between using Su and using SU when switching users in a shell

In the shell, if you need to switch users, and then run some commands as a specified user,

For example, you need to write a line of "Oracle_base=/oracle/app" to a. bash_profile file with an ORACLE user.

You can use the following statement

Su-oracle <<!

echo "Oracle_base=/oracle/app" >> bash_profile

Exit

!

About Su and Su-the difference between

Switching users can be implemented using SU Tom or Su-tom, but there is a difference

Su just switches identities, but the shell environment is still the original user's shell

Su-is the user's shell environment with the switch

The environment variable for path is valid when the shell environment is switched

Give examples:

For example, the root user in the/root/directory, Su Tom,

Switch to Tom User, but the directory is still under/root/.

If you use Su-tom

You can find that the directory also switches to Tom User's home directory

This is also caused by a number of command errors: why not Found

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