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Shell Programming and Scripting

if pid exist ?

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# 1  
Old 08-16-2010
if pid exist ?
Hi I need help to whit a script that start a program if a nother program is started first .
I thought something like this .

Code:
if [ "ps aux | grep program1" is bigger than 0 ] then start program 2

Thanks
# 2  
Old 08-17-2010
Code:
c=$(ps aux | grep program1|wc -l)

if [[ "$c" -eq 1 ]]
then
  start program 2
fi

# 3  
Old 08-17-2010
the above code will have $c as always one, as grep would be in the list of ps.

so it should be
Code:
c=`ps aux|grep program1|grep -v grep|wc -l`

Please correct me if i am wrong
# 4  
Old 08-17-2010
That's the reason I don't use "-eq 0"

if using your code, I have to change the if command to :

Code:
if [[ "$c" -eq 0 ]]

# 5  
Old 08-17-2010
sorry rdcwayx.

I was misled.
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