What will echo $$ command give Post: 302588341

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Top Forums UNIX for Dummies Questions & Answers What will echo $$ command give Post 302588341 by pandeesh on Sunday 8th of January 2012 01:39:27 PM

01-08-2012

Registered User

Quote:

Originally Posted by jayan_jay

That is your terminal process ID ..

Code:

$ echo $$
19095
$ tty
/dev/pts/39
$ ps -ef | grep "/dev/pts/39"
userid  1052 19095  0 07:36:14 pts/39   0:00 grep /dev/pts/39
$

Why we are not able to combine both 2nd and 3rd commands?
i have tried the below:

Code:

pandeeswaran@ubuntu:~$ ps -ef | grep `tty`
grep: a: No such file or directory
grep: tty: No such file or directory
pandeeswaran@ubuntu:~$ ps -ef | grep `tty|sh`
sh: not: not found
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.

What i am doing wrong?

Thanks

---------- Post updated at 12:05 AM ---------- Previous update was at 12:02 AM ----------

I have tried the below also:

Code:

pandeeswaran@ubuntu:~$ ps -ef|grep "`tty`"
1000      3059  2221  0 13:35 pts/0    00:00:00 grep --color=auto not a tty

---------- Post updated at 12:09 AM ---------- Previous update was at 12:05 AM ----------

Finally got it:

Code:

ps -ef|grep "`tty`"|cut -d" " -f9

is equiavlent to

Code:

echo $$

But still i don't know why

Code:

ps -ef|grep "`tty`"

returns some

Code:

grep --color=auto not a tty

at the end,

Thanks

pandeesh

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