Solution to environment variable problems when installing oracle in Linux

During the Oracle Installation Process today, the entire process was relatively smooth with reference to the information downloaded from the Internet to install oracle on RHEL5, but encountered some problems, although not very serious, however, after all, it is a problem and still uncomfortable. Please solve it here.
The main problem is the environment variables of oracle users. One step during oracle installation is to log on as an oracle user and edit the. bash_profile file. The edited content is as follows.

. Bash_profile file content:
 

1. #. Bash_profile
3. # Get the aliases and functions
4. If[-F ~ /. Bashrc]; then
5. .~ /. Bashrc
6. Fi
8. # User specific environment and startup programs
10. PATH = $ PATH: $ HOME/bin
12. TMP =/tmp; export TMP
13. TMPDIR = $ TMP; export TMPDIR
15. ORACLE_BASE =/opt/oracle; export ORACLE_BASE
16. ORACLE_HOME = $ ORACLE_BASE/10.2; Export ORACLE_HOME
17. ORACLE_SID = TSH1; export ORACLE_SID
18. ORACLE_TERM = xterm; export ORACLE_TERM
19. PATH = $ ORACLE_HOME/bin: $ PATH
21. Export PATH
23. LD_LIBRARY_PATH = $ ORACLE_HOME/lib:/usr/lib; export LD_LIBRARY_PATH
24. CLASSPATH = $ ORACLE_HOME/JRE: $ ORACLE_HOME/jlib: $ ORACLE_HOME/rdbms/jlib; export CLASSPATH
26. If[$ USER ="Oracle"]; Then
27. If[$ SHELL ="/Bin/ksh"]; Then
28. Ulimit-p16384
29. Ulimit-n65536
30. Else
31. Ulimit-u16384-N65536
32. Fi
33. Fi

When I log on as an oracle user, the following error is prompted:

Error message:
 

1. -Bash:/home/oracle/. bash_profile: line26: Syntax error near unexpected token 'then'
2. -Bash:/home/oracle/. bash_profile: line26:'If[$ USER ="Oracle"]; Then'

I checked a lot of information and wrote it like this. I also checked the shell programming materials and didn't see any problems. Please take a look.