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Thanks Don,
You're more than expected pointing out my requirement changed, showing your script and explain the different comparing to Ravinder's one. Perfect!

The reason I changed it just to make...

Thanks,

That works well, but not easy to understand, can you clear my mind :) please
Thanks.

input.txt

To make it easier, let assume xyz=2
So, I want look for the PIN line, then move it next xyz line (meaning: move it to next 2 lines)
The output should be like this:

line_before_pin_1...

Hi itkamaraj,

Where is the line_num coming from?

And you may mis-understand my initial post: the condition is based on another variable $xyz - not the data from file or $line

Hello everyone,

I want to process a data file using bash, I would like add a new line RIGHT after the time when i know "another variable met a value"

Like this:

while read line
do
...
...

The best way is to use "dos2unix" command to convert files has ^M character to standard unix format.

hmm, -o is great, I can change to ps -eo command,user
But if the command is long it'll be truncated.
ps -eo command:200,user
200 is a custom length for "command" can show, but we will face...

I often use "ps -ef" command to list all running processes. Now i want to customize the output to show only 2 parts: CMD and UID as below:

/bin/bash /usr/bin/run-parts /etc/cron.weekly root...

any idea are welcome.

this could help you:
https://www.unix.com/shell-programming-scripting/17010-how-validate-ip-address.html

Dear,

I have a script to start tomcat. I post here the main part of that script - called mytomcat.bash

function start()
{
shift
trap "" HUP
/usr/local/java/bin/java ...

It's great, Yogesh!

Thank for your help!

all,

I want to get next 2 lines in a file after a define pattern, for example: SALT

Input:


Output:


anyone can help?

OKie, got it work with --line-buffered option in grep.
Sorry, I was not carefully read it.

a million thanks!

You answer:


But I still keep the idea of using grep then redirect to file.

My feedback:

era, have you got any solution for it?

@era: Yes, I can see the result on the screen without redirection.
I left it run for half a day (without grep), and kill it, I got the output with over 200MB

era,

top -b will run looping, of course. I will use, for example: "top -b -d 10" it will refresh every 10 seconds.

Yes, I got them.
I don't want to get data first then using grep, because it make output file become a huge file. I want to run top -b for one or two days, that's the issue.

top -b | grep ^Cpu output is sure no error, it output should be like this:

"Cpu(s): 1.7%us, 0.8%sy, 0.0%ni, 96.9%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu(s): 0.0%us, 1.3%sy, 0.0%ni,...

HI all,

I want to capture cpu data in batch mode of "top" command and redirect to a file like this:
top -b > cpu.dat
it works!
But I want to capture only Cpu lines, so i have:
top -b | grep...

I want to delete any line in my data file that have a certain starting letter (./) as the next line, if the next line has difference starting letter (not "./") please keep it.

Ex Input:
...

Yah, it's great!
Thank Ygor!

Thank you,

It works fine, except the last item!
But it's OK.

Dear all,

I'm have a sorted array like this:
177
220
1001
2000
2001
2003
2005
notice that 2002 and 2004 are NOT in array.

Then user input a number INPUT, our script should return OUTPUT...