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2.11 Faster ksh and bash Startup with $- Test

Do you use the Korn shell - and does your account have an "ENV file" (2.2) (a startup file named in the ENV environment variable)? bash users, you probably have setup files like .bashrc or .bash_login. You might have the same problem (2.9) that C shell users have with .cshrc: noninteractive shells read aliases and other lines that you want to be read only by interactive shells. Speed up your file by adding a test like this:

case 




case $- in
  *i*);;
  *) return 0;;
esac
# COMMANDS BELOW THIS LINE WILL ONLY BE RUN BY INTERACTIVE SHELLS:
   ...

The test checks to see if the shell's -i option is set. If it isn't, the return 0 quits the file.

- JP


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