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Brilliant. Seems like I'll have to take a look at awk. Thanks.

EDIT: OK, seems like you can make it with grep also ... but what's the role of UNIX95 variable?
For my current level, I'll just...

ps -eo pid,comm,%cpu lists all processes (in increasing PID number).

How to get only the top-10 most CPU intensive ones? I know about top: this is BASH exercise.

I tried redirecting above code...

You all deserve one BIG thank you.

The combination of .* is new to me: always seen these two in "XOR mode": look for one- (.) or many-(*) random characters.

find . -name 'oos*.txt' indeed works...

Why is the red dot (after "oos") needed?
find . -regex './oos.*\.txt'

I have these two files in current dir:
oos.txt
oos_(copy).txt

I execute this find command:find . -regex './oos*.txt'And this outputs only the first file (oos.txt)! :confused:

Only if I add...

But KERN_ALERT is on a higher, 2nd, log-level than is KERN_CRIT! :confused:

Snippet from kernel.h:#define KERN_EMERG "<0>" /* system is unusable */
#define KERN_ALERT "<1>" /* action must be...

Yes, 'hello' is in System.map (in /boot directory):
c015c3c0 T sys_hello

Yes, I did reboot (into the new kernel). :)

As 'hello' is in System.map, does that mean that something is wrong with...

I'm trying to add a custom ("Hello world" :o) system call.
In /usr/src/linux/hello/ I put simple hello.c ...#include "linux/linkage.h" // for linking a system call
#include "linux/kernel.h" // for...

The solution is for dec.sh and inc.sh to lock counter.txt (and not as it is in OP). And also run both processes in for loop with ampersand (&). All this by trial&error ... will have to learn what...

QUESTION: How do I run processes in parallel, so that the counter (in counter.txt) would vary in value (instead of just "0" and "1")? That is, how to not sequentially run inc.sh and dec.sh?

The...

Just tried out the following code from "Using lockfiles in shell scripts (http://www.madmadmod.com/programming/31-lockfile-conditional-semaphore-file-creator.html)":
#!/bin/bash

if [ -e...

I'm using virtual file-system in /proc/ to print out 1) current working directory (CWD): ls /proc/$PID/cwd

2) command line*: cat /proc/$PID/cmdline

and 3) # of open files: ls /proc/$PID/fdinfo...

I did that already, I thanked you in the code's comments above. Thank you. :b:

Below is the before-GREP output. IPs that GREP extracts are in blue.
PING www.l.google.com (209.85.135.147) 56(84)...

Hi Jim,
above isn't the code but terminal output.

This is the code (user enters target domain | defaults to google.com) which resembles traceroute:
#!/bin/bash
domain=${1-www.google.com};
...

PING www.l.google.com (209.85.135.99) 56(84) bytes of data.
From 209.85.253.26 icmp_seq=1 Time to live exceeded

--- www.l.google.com ping statistics ---
1 packets transmitted, 0 received, +1...

There isn't actual word "ECHO_REPLY" but a line that starts with "64 bytes from [...]" when the script reaches the target computer (eg. google.com). Now, how do you write an if statement like:if...

So, for emulating traceroute it should be -c 1, right?

Can you help me with my 2nd question: how could I "break" from the for loop when above quoted change (from TTL_EXPIRED to ECHO_REPLY)...

Hi ctsgnb,
the "default option" works also without the colon. ;)

I'd be most grateful for any help on 2. question (on choosing max. TTL) ...
and of course any correction on my "thinking" in 1....

First, thank you for the reply.

I've seen other scripts that used, say, -c 2, but I don't (really) understand why (yes, I looked at man ping).

In ICMP's first 8 bits I'll be getting #11 (TTL...

Hello,

I'm trying to write (my own primitive) traceroute command that would write out all IPs that packets are hoping through. :)

So I've put the ping command inside a for loop

#!/bin/bash...