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store last command exit status in variable in shell script

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# 1  
Old 09-23-2011
store last command exit status in variable in shell script
Hello All

My req is to store the exit status of a command in shell variable

I want to check whether the file has header or not
The header will contain the string
DATA_ACQ_CYC_CNTL_ID

So I am running the command
Code:
head -1 $i | grep DATA_ACQ_CYC_CNTL_ID

Now I have to check if header is there then I will print Header exist if not then header doesn't exist

So the below I put

Code:
 
output=$?
echo $output
if [ $output -eq 0 ]
then 
echo header in flat file exist
else 
Flat File $i has no header
fi

but the code is not giving expected result when header doesn't exist
Its not showing
Code:
 
Flat File $i has no header

# 2  
Old 09-23-2011
Hi you missed a couple of things, try with these corrections:

Code:
#Here the command to execute

output=$?
echo $output
if [ "$output" -eq "0" ]
then 
      echo "header in flat file exist"
else 
      echo "Flat File $i has no header"
fi

# 3  
Old 09-23-2011
Modify the line output=`echo $?`
# 4  
Old 09-23-2011
Thanks for both of your reply but in case if condition fails the o/p is not
echo "Flat File $i has no header"

but Compare.sh[15]: Flat: not found
# 5  
Old 09-23-2011
works fine for me ..
Code:
i="filename"
head -1 $i | grep DATA_ACQ_CYC_CNTL_ID
output=`echo $?`
echo $output
if [ $output -eq 0 ]
then
echo "header in flat file exist"
else
echo "Flat File $i has no header"
fi

# 6  
Old 09-23-2011
Code:
else 
Flat File $i has no header

should be

Code:
 
else 
echo " File $i has no header "

---------- Post updated at 03:04 PM ---------- Previous update was at 03:03 PM ----------

you can check something like this also.

Code:
 
grep "DATA_ACQ_CYC_CNTL_ID" filename > /dev/null && echo "Header is there" || echo "Header is not there"

if your grep supports -q then no need to put > /dev/null
# 7  
Old 09-23-2011
Thanks a lot everyone .its working fine now
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