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capturing output of command line in an array

Hi

I am trying to execute a command using os.system. this command lists
the number of nodes alive in a cluster. I would like to capture the
output in list/array in python. IS it possible.?/

Here is my command
gstat -a
node13 2 ( 0/ 56) [ 0.00, 0.00, 0.00] [ 0.0, 0.0,
0.1, 99.9, 0.0] OFF
node12 2 ( 1/ 63) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.8, 0.0] OFF
node8 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 47.5, 0.0,
2.8, 49.7, 0.0] OFF
node2 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node1 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node7 2 ( 1/ 58) [ 0.99, 0.97, 0.91] [ 49.8, 0.0,
0.6, 49.7, 0.0] OFF
node11 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.8, 49.6, 0.0] OFF
node4 2 ( 1/ 59) [ 1.00, 1.00, 0.93] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node10 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 46.7, 0.0,
3.7, 49.7, 0.0] OFF
node5 2 ( 1/ 59) [ 1.00, 1.00, 0.92] [ 49.8, 0.0,
0.4, 49.7, 0.0] OFF
node6 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 49.5, 0.0,
0.9, 49.7, 0.0] OFF

I would like to have an array where each element contains the nodes

for example
a=[node13,node12,node2,node8,node1,node7,node 11]

any help would be appreciated

thanks

Oct 31 '07 #1
4 5632

On Oct 31, 2007, at 11:01 AM, am******@gmail.com wrote:
I am trying to execute a command using os.system. this command lists
the number of nodes alive in a cluster. I would like to capture the
output in list/array in python. IS it possible.?/

Here is my command
gstat -a
node13 2 ( 0/ 56) [ 0.00, 0.00, 0.00] [ 0.0, 0.0,
0.1, 99.9, 0.0] OFF
node12 2 ( 1/ 63) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.8, 0.0] OFF
node8 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 47.5, 0.0,
2.8, 49.7, 0.0] OFF
node2 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node1 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node7 2 ( 1/ 58) [ 0.99, 0.97, 0.91] [ 49.8, 0.0,
0.6, 49.7, 0.0] OFF
node11 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.8, 49.6, 0.0] OFF
node4 2 ( 1/ 59) [ 1.00, 1.00, 0.93] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node10 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 46.7, 0.0,
3.7, 49.7, 0.0] OFF
node5 2 ( 1/ 59) [ 1.00, 1.00, 0.92] [ 49.8, 0.0,
0.4, 49.7, 0.0] OFF
node6 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 49.5, 0.0,
0.9, 49.7, 0.0] OFF

I would like to have an array where each element contains the nodes

for example
a=[node13,node12,node2,node8,node1,node7,node 11]

any help would be appreciated
You might try os.popen to read in the output of your command.

It would be helpful to have more information about what you'd like to
do with your list. Do you just want to put the text of the
individual node lines from gstat into the list? If so, os.popen
should work for you. Or do you need to parse the lines and store
them in, say dictionaries? Tuples? If you need to parse it, you
could use module re, or even just string methods, depending on what
you're trying to do . . . .

HTH,

---
Lee Capps
Technology Specialist
CTE Resource Center
lc****@cteresource.org

Oct 31 '07 #2
Thanks Lee
I am looking to just get the node name from that info.
I dont need all other info
so my list would be just
alist=[node13,node12,node8,node1 ....]
is it possible??

On Oct 31, 9:44 am, Lee Capps <lca...@cteresource.orgwrote:
On Oct 31, 2007, at 11:01 AM, amjad...@gmail.com wrote:
I am trying to execute a command using os.system. this command lists
the number of nodes alive in a cluster. I would like to capture the
output in list/array in python. IS it possible.?/
Here is my command
gstat -a
node13 2 ( 0/ 56) [ 0.00, 0.00, 0.00] [ 0.0, 0.0,
0.1, 99.9, 0.0] OFF
node12 2 ( 1/ 63) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.8, 0.0] OFF
node8 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 47.5, 0.0,
2.8, 49.7, 0.0] OFF
node2 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node1 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node7 2 ( 1/ 58) [ 0.99, 0.97, 0.91] [ 49.8, 0.0,
0.6, 49.7, 0.0] OFF
node11 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.8, 49.6, 0.0] OFF
node4 2 ( 1/ 59) [ 1.00, 1.00, 0.93] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node10 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 46.7, 0.0,
3.7, 49.7, 0.0] OFF
node5 2 ( 1/ 59) [ 1.00, 1.00, 0.92] [ 49.8, 0.0,
0.4, 49.7, 0.0] OFF
node6 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 49.5, 0.0,
0.9, 49.7, 0.0] OFF
I would like to have an array where each element contains the nodes
for example
a=[node13,node12,node2,node8,node1,node7,node 11]
any help would be appreciated

You might try os.popen to read in the output of your command.

It would be helpful to have more information about what you'd like to
do with your list. Do you just want to put the text of the
individual node lines from gstat into the list? If so, os.popen
should work for you. Or do you need to parse the lines and store
them in, say dictionaries? Tuples? If you need to parse it, you
could use module re, or even just string methods, depending on what
you're trying to do . . . .

HTH,

---
Lee Capps
Technology Specialist
CTE Resource Center
lca...@cteresource.org

Oct 31 '07 #3
En Wed, 31 Oct 2007 19:20:56 -0300, <am******@gmail.comescribió:
I am looking to just get the node name from that info.
I dont need all other info
so my list would be just
alist=[node13,node12,node8,node1 ....]
is it possible??
node13 2 ( 0/ 56) [ 0.00, 0.00, 0.00] [ 0.0, 0.0,
0.1, 99.9, 0.0] OFF
node12 2 ( 1/ 63) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.8, 0.0] OFF
node8 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 47.5, 0.0,
2.8, 49.7, 0.0] OFF
Try this:

import subprocess
p = subprocess.Popen( ["your","command","+args"], stdout=subprocess.PIPE)
lines = p.stdout.readlines()
p.wait()

If you are only interested in the first word in each line, you may replace
the lines = ... above with this:

nodes = [line.split(' ', 1)[0] for line in p.stdout]

--
Gabriel Genellina

Nov 1 '07 #4
thanks Lee,
I would just like to get the "node" in that list.
so it would be something like this
alist=[node13,node12,node8,node2,node1.....]
I dont want the whole info
is it possible??
On Oct 31, 9:44 am, Lee Capps <lca...@cteresource.orgwrote:
On Oct 31, 2007, at 11:01 AM, amjad...@gmail.com wrote:
I am trying to execute a command using os.system. this command lists
the number of nodes alive in a cluster. I would like to capture the
output in list/array in python. IS it possible.?/
Here is my command
gstat -a
node13 2 ( 0/ 56) [ 0.00, 0.00, 0.00] [ 0.0, 0.0,
0.1, 99.9, 0.0] OFF
node12 2 ( 1/ 63) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.8, 0.0] OFF
node8 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 47.5, 0.0,
2.8, 49.7, 0.0] OFF
node2 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node1 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node7 2 ( 1/ 58) [ 0.99, 0.97, 0.91] [ 49.8, 0.0,
0.6, 49.7, 0.0] OFF
node11 2 ( 1/ 59) [ 0.99, 0.97, 0.91] [ 46.6, 0.0,
3.8, 49.6, 0.0] OFF
node4 2 ( 1/ 59) [ 1.00, 1.00, 0.93] [ 46.6, 0.0,
3.7, 49.7, 0.0] OFF
node10 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 46.7, 0.0,
3.7, 49.7, 0.0] OFF
node5 2 ( 1/ 59) [ 1.00, 1.00, 0.92] [ 49.8, 0.0,
0.4, 49.7, 0.0] OFF
node6 2 ( 1/ 59) [ 1.00, 1.00, 0.94] [ 49.5, 0.0,
0.9, 49.7, 0.0] OFF
I would like to have an array where each element contains the nodes
for example
a=[node13,node12,node2,node8,node1,node7,node 11]
any help would be appreciated

You might try os.popen to read in the output of your command.

It would be helpful to have more information about what you'd like to
do with your list. Do you just want to put the text of the
individual node lines from gstat into the list? If so, os.popen
should work for you. Or do you need to parse the lines and store
them in, say dictionaries? Tuples? If you need to parse it, you
could use module re, or even just string methods, depending on what
you're trying to do . . . .

HTH,

---
Lee Capps
Technology Specialist
CTE Resource Center
lca...@cteresource.org

Nov 1 '07 #5

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