error in script containing grep

Question

I am getting GREP invalid option error in the code below :

file=$(find . -mtime -4 |ls -lt)
for f in $file
do
 po=$(echo $f|cut -d"_" -f2)
 find . -mtime -4 |ls -lt|grep "$po"|while read fn
   do
         if [ -s $fn ]; then #checks if the file is not empty
           if [ -d tmp ]; then
                rm -r tmp
           fi
           mkdir tmp
           cp -p $fn /tmp/$fn
           break
         fi
   done
done

Basically I am trying to sort the list which I am getting from find then looping through it taking the latest non zero file for a PO.

List of file is

-rw-rw-r-- 1 loneranger loneranger 37 Jul 21 06:30 belk_po12345_20140721.log
-rw-rw-r-- 1 loneranger loneranger 24 Jul 22 06:30 belk_po12345_20140722.log
-rw-rw-r-- 1 loneranger loneranger  0 Jul 23 06:30 belk_po12345_20140723.log
-rw-rw-r-- 1 loneranger loneranger 11 Jul 24 12:00 belk_po12348_20140723.log

PO - po12345 or po12348 these are...

@Asfakul,Why you are using this command file=$(find . -mtime -4 |ls -lt) — Kalanidhi
– Kalanidhi, Commented Jul 25, 2014 at 7:51
I am using this for sorting list which I am getting out of find command. I have changed it to find . -mtime -4 |xargs ls -lt — redsoxlost
– redsoxlost, Commented Jul 25, 2014 at 8:03

Sylvain Leroux · Accepted Answer · 2014-07-25 00:28:14Z

1

Basically I am trying to sort the list which I am getting from find then looping through it taking the latest non zero file for a PO.

You might use find for all of that except the final sort:

find . -size '+1c' -type f -printf "%f %T@\n" | sort -k2

The find part search files (-type f) of more than 1 byte long (-size '+1c') and for each one print the file's base name (%f) and the modified time as seconds since Jan. 1, 1970, 00:00 GMT (%T@). After that, it is a simple sort on the second field (timestamp).

Of course, you might add all the search criterion you need on find but that's the basic idea.

And if you want to loop over the result, do as usual:

find . -size '+1c' -type f -printf "%f %T@\n" | 
    sort -k2 |
    while read fname mts; do
       # ...
    done

answered Jul 25, 2014 at 0:28

Sylvain Leroux

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