How do we display specific row of an output from bottom given line number?


 
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# 8  
Old 02-12-2020
Quote:
Originally Posted by mohtashims
...

But, as I shared the output of your suggestion i get a list of rows and not that single particular row corresponding to the argument passed to the script.
,,,
Did you have the first positional parameter set to 3 or 4? If empty, the entire list will be printed. As will easily be seen in an execution log...


Quote:
Thus the argument to my script is certainly an integer.
q.e.d.
# 9  
Old 02-13-2020
Quote:
Originally Posted by RudiC
Did you have the first positional parameter set to 3 or 4? If empty, the entire list will be printed. As will easily be seen in an execution log...


q.e.d.
@Rudic thank you for the input and it is certainly returning a single row however not the intended row.

If you look at the output when i pass 4 to get the 4th row it returns the 3rd row as the first line / row of the output is total 400

Code:
-bash-4.2$ ls -lt | sed -n "${1}p"
total 400
-rwxrwxrwx 1 user1 user 21627 Feb 11 17:17 httpd.conf_1581421731
-rwxrwxrwx 1 user1 user 15445 Feb 11 17:14 httpd-ssl.conf_1581421731
-rwxrwxrwx 1 user1 user 21624 Feb 11 17:13 httpd.conf_1581421456
-rwxrwxrwx 1 user1 user 15445 Feb 11 15:39 httpd-ssl.conf_1581421372

Code:
./test.sh 4
-rwxrwxrwx 1 user1 user 21624 Feb 11 17:13 httpd.conf_1581421456

instead of the 4th row i.e.

Code:
-rwxrwxrwx 1 user1 user 15445 Feb 11 15:39 httpd-ssl.conf_1581421372

Now when i move from Linux to AiX (ksh shell) it does not print the first line and simply starts with the row printing the files. See output of AiX below:

Code:
/tmp>chmod 755 test.sh
/tmp>ls -lt *.log
-rw-rw-r--    1 root   dba        48969945 Feb 13 10:43 fatal.log
-rw-rw-r--    1 root   dba       102608600 Feb 13 10:43 fatal_info.log
-rw-rw-r--    1 root   dba       204800 Feb 13 10:16 vmt.log
-rw-rw-r--    1 root   dba     192437558 Feb 11 00:06 service.log

Thus, we are not sure if the first row total 400 will be printed everytime on each of the operating systems as it is a factor in deciding the row number. That is the very reason I was using ls -ltr instead of ls -lt and getting the latest timestamp file from bottom-top instead of top-bottom.

Can you please suggest ?

Last edited by mohtashims; 02-13-2020 at 01:17 AM..
# 10  
Old 02-13-2020
Quote:
instead of the 4th row i.e.
Which is correct since:
Code:
 ls -lt | sed -n "${1}p"

will return as first line:
Code:
total 400

So what you say the 3rd is not but the 4th
But
Code:
ls -lt *.log

returns without the total line as you specified what to return, and I doubt it being only specific to AIX, or linux on AIX
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