parameter $$1,$$2 1

[jazie]

I was reading a unix script written by someone else and came across this type of parameter passing $$1 (notice double dollar sign and not single). Does anyone know what this means? I'm familiar with the single $ but not $$.

Thanks

 

[PHV]

I guess something like eval myVar=\$$1
So $1 contains the name of an environment variable the script reads into myVar

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ222-2244

 

[vgersh99]

nope.

$$ - pid of a process

$$1 - pid of a process suffixed with '1'

echo $$1

vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[jazie]

Kudos to PHV and vgersh99! pid of a process makes sense with the script. Thanks!

 

[Chacalinc]

could you post the script (if it is not too large). This is the first time I see that and I'm wondering how do you use it.

Cheers.

 

[jazie]

The script is quite long and it would not make sense if I post a snippet of it, but here is a very simple example in ksh.

print "the PID of the current process is $$"

my script concatenate $$ with a prefix parameter, i.e. $$($var)

 

[Chacalinc]

oh, that makes sense... thanks a lot!