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Need help in a simple shell script


 
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# 1  
Old 10-24-2007
Need help in a simple shell script

Hi All

I have requirement to write a shell script which would look for the userid which is logged in , and once the User id is found i would delete certain
lines from a parameter file ..

here is what iam using

a=ps -o user | grep -v user | uniq

then using an if condition and moving on

can anyone tell me what is the bug it is not able to find the instance name ..

can anyone help me on this

This is my sample thing i am doing (very Simple)

a=ps -o user | grep -v user | uniq #instance name is cool

a = ps -o user | grep -v USER | uniq
if [ "$a" = "cool" ];then
echo " This is cool"
else
echo " Not Equal"
fi

Please help me on this

Thanks !!!!
# 2  
Old 10-24-2007
Quote:
Originally Posted by raghav1982
Hi All

I have requirement to write a shell script which would look for the userid which is logged in , and once the User id is found i would delete certain
lines from a parameter file ..

here is what iam using

a=ps -o user | grep -v user | uniq

then using an if condition and moving on

can anyone tell me what is the bug it is not able to find the instance name ..

can anyone help me on this

This is my sample thing i am doing (very Simple)

a=ps -o user | grep -v user | uniq #instance name is cool

a = ps -o user | grep -v USER | uniq
if [ "$a" = "cool" ];then
echo " This is cool"
else
echo " Not Equal"
fi

Please help me on this

Thanks !!!!
Just by looking at it, when you set the a variable it should be:
Code:
a=`ps -o user | grep -v USER | uniq`

# 3  
Old 10-24-2007
try this

You need to quote out stuff, also run the script as a bourne shell script

#! /bin/sh
aa=`ps -o user | grep -v USER | uniq`
if [ ${aa} = "cool" ] ; then
echo "${aa} is cool"
...

Try looking at SED or Ed to delete lines in a file within the test statement,
though someone else might have a easier way.
# 4  
Old 10-26-2007
Quote:
Originally Posted by raghav1982
Hi All

I have requirement to write a shell script which would look for the userid which is logged in , and once the User id is found i would delete certain
lines from a parameter file ..
...
This is my sample thing i am doing (very Simple)

a=ps -o user | grep -v user | uniq #instance name is cool

a = ps -o user | grep -v USER | uniq

To store the output of a command in a variable, use command substitution:

Code:
a=$( ps -o user | grep -v USER | uniq )

Quote:
if [ "$a" = "cool" ];then
echo " This is cool"
else
echo " Not Equal"
fi

You don't need grep or uniq:

Code:
case $( ps -o user ) in
     *USER*) echo "alcool" ;;
     *) echo "uncool" ;;
esac

However, you probably should use who or w to determine whether someone is logged in.
# 5  
Old 10-26-2007
Thanks all guys it worked ..

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