Shell Programming and Scripting

Hey franklin Thanks for your reply
But
nawk 'NR==FNR{a[$0];next}!($1 in a){print;c++}END{if(c){print "FAILED"}}' file2 file1 >> /tmp/file3

is adding the string FAILED at the end of the file after all the other strings,is there any way to add this string at the beginning of the file.This is very important because after this line of code
i will be checking the condition
if [ -s /tmp/file3 ]

and if there are some string which came as the output of comparison then i have to include FAILED as the starting string.


Currently the code is:
nawk 'NR==FNR{a[$0];next}!($1 in a){print;c++}END{if(c){print "FAILED"}}' file2 file1 >> /tmp/file3
if [ -s /tmp/file3] ; then
echo "FAILED on today " >> /tmp/file3

and it is giving the output as:

text1
text2
text4
FAILED
FAILED on today

but my requirement is

the output should come as:
FAILED text1
FAILED text2
FAILED text4
FAILED on today



Could you please help??

Thanks

With the given solution you should be able to fit the code. Is this what you're looking for?

Code:

nawk 'NR==FNR{a[$0];next}!($1 in a){print "FAILED " $0;c++}END{if(c){print "FAILED on today"}}' file2 file1 >> /tmp/file3

Regards

finally got what i wanted...Thanks..!!

Hi all,
i have a doubt related to above problem only

the line
nawk 'NR==FNR{a[$0];next}!($1 in a){print "FAILED " $0;c++}END{if(c){print "FAILED on today"}}' file2 file1 >> /tmp/file3

it will check whether all the strings in file1 and file2 are same or not and it will print all the strings in file1 which are not present in file2
but now i have encountered a problem
suppose file2 is completely empty then the above line should print all the strings in file1
as file2 is empty, but it is not happening.
Can anyone throw some light what is the problem with the above line of code??

Thanks in advance.

Test the file first:

Code:

[ ! -s file2 ] && echo "file file2 is empty"

Regards

Hi Franklin,Thanks for your reply but i guess i didnt explain my problem well.

See i have two files file1 and file2

file1 will contain some data
like
file1
text1
text2
text3
text4
text5


and file i have obtained by making some changes in some other file.And file two always changes dynamically
like sometimes it may contain

file2
text1
text2
text3



sometimes it may contain
text1
text2
text5

and sometimes it may contain nothing
Now i have to compare these two files and redirect the output to a third file eg :file3which will contain the strings which are present in file1 and not in file2
and also i have to insert a string at the beginning and at the end on all the lines in the output file3.

After that i am using an if condition on the file3 to check whether there is some data in file3.

now my doubt is

nawk 'NR==FNR{a[$0];next}!($1 in a){print "FAILED " $0;c++}END{if(c){print "FAILED on today"}}' file2 file1 >> /tmp/file3

this above line is comparing file1 and file2 and printing all the strings present in file1 but not in file2

so if file1 is

text1
text2
text3

and file2 is empty i.e it does not contain any data then my output file i.e file3

should contain
FAILED text1
FAILED text2
FAILED text3
Timestamp

but my problem is
the given line is not doing that



currently my script is
nawk 'NR==FNR{a[$0];next}!($1 in a){print "FAILED " $0;c++}END{if(c){print "Timestamp"}}' file2 file1 >> /tmp/file3
today=`date`
if [ -s /tmp/file3 ] ; then
echo "FAILED for above servergroups on $today " >> /tmp/file3

else
echo "Successful for $e_host on $today " >> /tmp/file3
fi

Please suggest some change in the line
nawk 'NR==FNR{a[$0];next}!($1 in a){print "FAILED " $0;c++}END{if(c){print "Timestamp"}}' file2 file1 >> /tmp/file3


so that if file2 is completely empty then also i should get all the strings present in file1 with the extra strings inserted at the beginning and at the end.

Thanks in advance.

It don't work if file2 is empty, you must have at least a newline in it.
Place this command before the awk command to place a newline in the file if the file is empty:

Code:

[ ! -s file2 ] && echo > file2

Regards