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Extract tty from ps command

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# 1  
Old 02-19-2012
Extract tty from ps command
When I try to extract tty from ps command , at time we get output , at times we dont.
for eg i executed below quesry continulusly for some time,Actually i feel its because sometime pid allocated has some additional space at begining which causes this issue.
->
Code:
ps | grep "/-ksh" | tail -1 | cut -f4 -d' '

echo $a
pts/2
->
Code:
ps | grep "/-ksh" | tail -1 | cut -f4 -d' '

is there foolproof way to extra tty , cannot use tty or whoami
# 2  
Old 02-19-2012
You could try:

Code:
ps | grep "/-ksh" | tail -1 | awk '{print $2}'

# 3  
Old 02-20-2012
I think it is the classic grep your own grep. You should add a grep -v grep or use square brackets around one of the characters in the search string to avoid grepping your own grep command. Also, shouldn't it be \- instead of /- ? We could combine this like this:
Code:
ps | grep "[-]ksh" | ...

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