Store output in variables instead of files


 
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# 1  
Old 09-05-2015
Store output in variables instead of files

Hi All,
I have written a (bash) function which generates multiple files say file1 file2 file3
now I want to reduce the generation of these three files i.e. store the output of three files in variables, and generate the same results, in-order to avoid multiple creation of files
how is that possible can any one suggest a code please...

Code:
functionA () 
{ poihostname=$1
ssh -n $poihostname /usr/ucb/ps -awwx | egrep "java|sys1" | awk '{print $1,$5}' > file1
        cat file1 | awk  -F/ '{print $1,$3}'   > file2
        while read userpid username
                do 
                ssh -n $username@$poihostname pwdx $userpid | awk '{print $2}'>> file3
                done < file2

while read path
do
egrep  "^${path}$" file3
if [ $? -ne 0 ]
then
echo "DEV path $path is missing " >> finalresult
fi
done < masterfile }

# 2  
Old 09-05-2015
Without seeing/knowing every single detail of your files 1 - 3, it seems to me that you could do without any of them by creatively piping the results.
If you post some more details, we might be able to put together a reasonable solution.
# 3  
Old 09-05-2015
Hi sam@sam,

Is it possible for you to post a few lines from the output of these commands without the rest of the pipes?
Code:
ssh -n $poihostname /usr/ucb/ps -awwx | egrep "java|sys1"

and
Code:
ssh -n $username@$poihostname pwdx $userpid

This User Gave Thanks to Aia For This Post:
# 4  
Old 09-05-2015
These two lines can be reduced from:
Code:
ssh -n $poihostname /usr/ucb/ps -awwx | egrep "java|sys1" | awk '{print $1,$5}' > file1
        cat file1 | awk  -F/ '{print $1,$3}'   > file2

to
Code:
ssh -n $poihostname /usr/ucb/ps -awwx | egrep "java|sys1" | \
      awk '{print $1,$5}' | awk  -F/ '{print $1,$3}'   > file2

You can reduce the use of the egrep and two awks to a single invocation of awk also. Show use the output of
Code:
ssh -n $poihostname /usr/ucb/ps -awwx

and somebody will provide a suitable awk command.
This User Gave Thanks to fpmurphy For This Post:
# 5  
Old 09-05-2015
Hi, I was working on this ...for long time & stuck at some point
Now I m passing 3 variables poihostname userpid and username
Code:
poihostname =dellsys.com
while read userpid username
                do 
                ssh -n $username@$poihostname pwdx $userpid | awk '{print $2}'>> currpids
                done < ss

ss is filename and output is generated in a file called currpids.
more currpids
dell/server/serevr
dell/server/apache
dell/server/weblogic
now my requirement is I want to store the output in a variable instead of storing output in a file(currpids)........I have created a code but I m getting output for only third value(dell 457) & im not getting the output for 1st & 2nd values from file ss , let me know If your require any more info
more ss
dell 123
dell 456
dell 457
I m passing 3 parameters in file ss, but not getting accurate results
my new code look like this
Code:
while read userpid username
                do 
             currpids_71=`ssh -n $username@$poihostname pwdx $userpid | awk '{print $2}'`
                done < ss


Last edited by sam@sam; 09-05-2015 at 08:52 PM..
# 6  
Old 09-06-2015
Hi sam@sam,

You are asking why currpids_71 contains only the third value(dell 457). This occurs because currpids_71 gets overwritten each time through the loop.

Since you are using bash you can use an array to store the outputs.
Code:
currpids_71+=( $(ssh -n $username@$poihostname pwdx $userpid | awk '{print $2}) )

Now, to access each element on that array you do it by index.
Code:
echo ${currpids_71[0]}

or all of them at once
Code:
echo ${cuppids_71[@]}

Alternatively, you can build a long string, appending to the same string variable the output of ssh, each time through the loop
Code:
currpids_71="$currpids_71 $(ssh -n $username@$poihostname pwdx $userpid | awk '{print $2})"


Last edited by Aia; 09-06-2015 at 09:18 PM.. Reason: Grammar
This User Gave Thanks to Aia For This Post:
# 7  
Old 09-07-2015
Solved

Last edited by sam@sam; 09-07-2015 at 01:12 PM..
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