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shell programming

shell programming# Unix - 噫吁兮，危乎高哉

d*o2000-07-06 07:07

1 楼

I have an Java application, say, called 'app1'. I want to write
a B shell script to invoke it. the reason to do that is to
record how many files 'app1' opened by useing 'lsof'. Problems:
1. how to record the output of 'lsof'?
(for example, if it is in Perl, I can do $output = `lsof`. what
is the counterpart in shell script?)
2. in the end of my shell script, I'll invoke the program 'app1'
by just say 'app1'. How can I use 'lsof' again _AFTER_ 'app1'
is running?
one way is to write like this:
app

p*a2000-07-06 07:07

2 楼

output=`lsof`
looping=1
app1 &
while [ looping ]
do
sleep 120
output=`lsof`
echo "# of files opened: $output"
# some condition to set looping variable
...
done

【在 d*o 的大作中提到】

: I have an Java application, say, called 'app1'. I want to write
: a B shell script to invoke it. the reason to do that is to
: record how many files 'app1' opened by useing 'lsof'. Problems:
: 1. how to record the output of 'lsof'?
: (for example, if it is in Perl, I can do $output = `lsof`. what
: is the counterpart in shell script?)
: 2. in the end of my shell script, I'll invoke the program 'app1'
: by just say 'app1'. How can I use 'lsof' again _AFTER_ 'app1'
: is running?
: one way is to write like this:

d*o2000-07-06 07:07

3 楼

very, very appreciate your help. Thanks a lot!

【在 p*a 的大作中提到】

:
: output=`lsof`
: looping=1
: app1 &
: while [ looping ]
: do
: sleep 120
: output=`lsof`
: echo "# of files opened: $output"
: # some condition to set looping variable