grep and loop files

Shell Programming and Scripting
1

Hi ,

  1. I want to grep two or three lines from a set of files and put the grepped lines into again a set of files.like
    file1-greppedfile1
    file2-greppedfile2

then again do some format to the grepped files with sed or awk then create another set of files.
How can I do this in loop?

2.I want to grep a date within a file.The date is at almost end of the file
but there are also some dates above the last date format which i have to grep.

Help will be appreciated...

Thanks

2

Do not post questions without trying to solve the problem yourself based on your understanding. Post what have you tried so far and where exactly are you stuck?

3

Your second problem looks like you want to get from a file the last line containing a date. If so, then try something like

grep date file | tail -n 1

I'm afraid I don't understand your first problem; give us an example?

4

Hi,
I am beginner in shell scripting.I have done the grep for one file like

grep -i 'abcd' from file1>file2
grep '1234' from file1>>file2

then by awk I have divided '1234/234' and appended file2>file3.

This I have to do it for 5 files.
for each file there must be seperate result file.I can do it manually but this is to be run like a job.
I hope you got my my problem..

5

Alrighty, this might not be the most efficient way of doing this, but you can give this a try..

suppose you have file1, file2,file3,file4 and so on to grep,

arg1=abcd
arg2=1234
for i in file*
do
grep -i $arg1 $i >$arg1_$i
grep -j $arg2 $i >$arg2_$i
done

find . -empty | xargs rm

This should do the trick.