Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

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

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting How do we display specific row of an output from bottom given line number?
# 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 02:17 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
This User Gave Thanks to vbe For This Post:
drl
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed command to replace a line at a specific line number with some other line

my requirement is, consider a file output cat output blah sdjfhjkd jsdfhjksdh sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf hellow there this doesnt look good et cetc etc etcetera i want to replace a line of line number 4 ("this doesnt look good") with some other line ... (3 Replies)
Discussion started by: vivek d r
3 Replies

2. Shell Programming and Scripting

Cut from specific line number to a line number

Hi All, I've a file like this.. Sheet1 a,1 a,2 a,3 a,4 a,5 Sheet2 a,6 a,7 a,8 a,9 a,10 Sheet3 a,11 a,12 a,13 (7 Replies)
Discussion started by: manab86
7 Replies

3. Homework & Coursework Questions

Using ls or echo to display a specific output

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: What single command line would you enter to get the following output? 8140 drwxr-xr-x 9 root bin 18 Jan 20... (6 Replies)
Discussion started by: dasboot
6 Replies

4. UNIX and Linux Applications

display which line returns specific output

Hi, I'm trying to figure out a way to find which line in my file.txt with IP addresses: 192.168.0.1 192.178.0.2 etc... returns specific result when I execute command affecting all lines. For example when I run: for line in `cat file.txt`; do snmpget $line done it displays the... (5 Replies)
Discussion started by: svetoslav_sj
5 Replies

5. Shell Programming and Scripting

Help with ksh script to display output with specific contents

This is Input - starts with Storage Group Name and ends with Shareable and the loop continues all I need is Storage group name and Alu numbers in the below output format requested. Storage Group Name: abcd Storage Group UID: 00:00:000:00:0:0:0 HBA/SP Pairs: HBA UID ... (6 Replies)
Discussion started by: maddysa
6 Replies

6. Shell Programming and Scripting

Display Specific line number using tail command

Hi , 1)i want to display specific line number using tail command. e.g. display 10 line from end. Please help... 2)Want to display line 10 to 15 (from end)using tail command) (2 Replies)
Discussion started by: vivek1489
2 Replies

7. Shell Programming and Scripting

Display a menu on bottom right of screen

Hi, I have a menu of around 10 lines with options. I want to display it in bottom right corner of screen for better display. I can do it with clear screen. But I don't want to use it, because it will clear the existing text. After one choice from menu is executed, the menu should just place... (3 Replies)
Discussion started by: som.nitk
3 Replies

8. Shell Programming and Scripting

Take each number in table row and find the difference from the corresponding line

I have a two files containing numbers like below. First one contains one number on each line, the other is a table of numbers, each separated by a space. There are the same number of lines in each file. I want to take each number in the row of the table and find the difference from the... (12 Replies)
Discussion started by: kristinu
12 Replies

9. Shell Programming and Scripting

using sed to replace a specific string on a specific line number using variables

using sed to replace a specific string on a specific line number using variables this is where i am at grep -v WARNING output | grep -v spawn | grep -v Passphrase | grep -v Authentication | grep -v '/sbin/tfadmin netguard -C'| grep -v 'NETWORK>' >> output.clean grep -n Destination... (2 Replies)
Discussion started by: todd.cutting
2 Replies

10. Shell Programming and Scripting

Adding a columnfrom a specifit line number to a specific line number

Hi, I have a huge file & I want to add a specific text in column. But I want to add this text from a specific line number to a specific line number & another text in to another range of line numbers. To be more specific: lets say my file has 1000 lines & 4 Columns. I want to add text "Hello"... (2 Replies)
Discussion started by: Ezy
2 Replies
Login or Register to Ask a Question