02-10-2005
$- is used to show current shell options (in Bash, Korn and others)... These can be options passed during the shells invocation (i.e. when the shell is first started), or set whilst the shell is running with the "set" command. For example....
$ echo $-
himBH
$ set -x
$ echo $-
himxBH
$ set +x
$ echo $-
himBH
$ bash -r # start another shell with -r set
$ echo $-
himrBH
$ exit
$ echo $-
himBH
Read the manual page for the shell you're using and take a look at the "set" section and also the invocation options section.
I check the value of $- in my
.kshrc file to make sure that it is executed for interactive shells only.
Cheers
ZB
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