BladeSystem Forums have moved here
To make BladeSystem information easier to find, we have moved the BladeSystem forums here, to Servers and Operating Systems.
Languages and Scripting
Showing results for 
Search instead for 
Do you mean 

sh script - grep files for string and only use latest file

SOLVED
Go to Solution
Super Advisor

sh script - grep files for string and only use latest file

I need to be able to search a directory for a string.

But, if there are multiple files that contain that string, only use the latest file.

 

I thought I had it, but it does not seem to work.

file=`grep -l ${tn} *| tail -1`

 

I tried head too, but that does not work either...

 

This is an HPUX server with #!/bin/sh

 

4 REPLIES
Honored Contributor

Re: sh script - grep files for string and only use latest file

Try this:

 

file=$(grep -l ${tn} * | xargs ls -1tr | tail -1)

 The 'xargs ls -1tr' (yes, that is the number one, NOT a lower-case L) will sort the files by last modification time in reverse order (newest last) and only print the file name on the line.

 

# man ls 

 

for more details.

 

Also, it is better to use the $( ) syntax for commands rather than the back-ticks enclosing the commands.  The $( ) is much easier to read.

Honored Contributor

Re: sh script - grep files for string and only use latest file

You could also do:

 

file=$(grep -l ${tn} * | xargs ls -1t | head -1)

 This will sort the files by last modification time with the newest FIRST in the list and the head -1 will give you the first file.

Acclaimed Contributor

Re: sh script - grep files for string and only use latest file

>The 'xargs ls -1tr' (yes, that is the number one

 

No real need to use -1 if you are sending the output of ls(1) to pipe or a file.

 

If you know you don't have zillions of files you can get away with:  :-)

file=$(ls -t $(grep -l ${tn} *) | head -1)

 

Above is where you need to use $() vs ``, since nested.

Highlighted
Super Advisor

Re: sh script - grep files for string and only use latest file

Thank you! Worked like a charm!