W Command Certain Columns

I am looking to display the w (who) command to show only the

User TTY IDLE

http://screencast.com/t/vXb74kguJ

13:15:38 up 8 days, 16:48, 47 users, load average: 1.47, 0.95, 0.51
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
rf3 pts/0 192.168.11.72 05:58 48.00s 6.60s 0.00s -bash
user21 pts/1 192.168.21.177 04:32 8:41m 0.05s 0.00s -bash
user7 pts/2 192.168.11.114 17Mar15 6days 1.07s 0.00s -bash
user7 pts/3 192.168.11.114 20Mar15 4:54m 9.75s 0.00s -bash
user6 pts/4 192.168.11.85 11:02 7.00s 55.58s 0.01s -bash
user14 pts/5 192.168.11.183 05:06 29:08 2.80s 0.01s -bash
user14 pts/6 192.168.11.155 05:30 13:28 2.75s 0.00s -bash
user23 pts/7 192.168.11.62 05:48 25:09 0.95s 0.00s -bash
rf5 pts/8 192.168.11.118 05:58 6:51 5.30s 0.01s -bash
user2 pts/9 192.168.11.140 08:34 1:19 44.74s 0.00s -bash
user14 pts/10 192.168.11.141 06:02 12:14 9.46s 0.00s -bash
rf12 pts/12 192.168.11.69 06:02 2:07 9.44s 0.00s -bash
root pts/13 localhost.locald 12:29 9:10 0.05s 0.05s -bash
rf6 pts/14 192.168.11.79 06:04 14.00s 9.05s 0.00s -bash
user14 pts/15 192.168.21.113 06:23 11:29 1.71s 0.00s -bash
user5 pts/16 192.168.11.126 06:24 6:56 4.59s 0.00s -bash
user5 pts/17 192.168.11.126 06:25 6:19 31.59s 0.01s -bash
user11 pts/18 192.168.11.125 06:26 28:10 2.90s 0.01s -bash
user12 pts/19 192.168.21.123 06:35 13:16 0.88s 0.00s -bash
rf7 pts/20 192.168.11.80 06:35 2:06 7.64s 0.00s -bash
user12 pts/21 192.168.21.123 06:36 41:55 0.12s 0.00s -bash

So far I have this

w | awk {'printf ("6s\ts\n", $1, $2, $3, $5)'} |more
13:20:16 up
USER TTY
rf3 pts/0
user21 pts/1
user7 pts/2
user7 pts/3
user6 pts/4
user14 pts/5
user14 pts/6
user23 pts/7
rf5 pts/8
user2 pts/9
user14 pts/10
rf12 pts/12
root pts/13
This only shows the 2 columns

w |awk '{print $1, $2, $3, $5}'

13:21:01 up 8 16:53,
USER TTY FROM IDLE
rf3 pts/0 192.168.11.72 20.00s
user21 pts/1 192.168.21.177 8:46m
user7 pts/2 192.168.11.114 6days
user7 pts/3 192.168.11.114 4:59m
user6 pts/4 192.168.11.85 3:42
user14 pts/5 192.168.11.183 34:31
user14 pts/6 192.168.11.155 18:51
user23 pts/7 192.168.11.62 30:32
rf5 pts/8 192.168.11.118 12:14
user2 pts/9 192.168.11.140 1.00s
user14 pts/10 192.168.11.141 17:37
rf12 pts/12 192.168.11.69 30.00s
This shows some what hard to read and the columns don't line up correctly

is there a way to tab them in to columns that line up properly, or even something similar to the TOP command where the list will keep refreshing?

Where Does The Bash Command Stop

hi guys, im trying to understand the bash rules or hash tag rules.

my understanding is the the everything to the right of the bash command is not executed? is this right? and you disable it by using a new line to enter executable commands?

.profile And Bash.rc

hi guys

i was taught that /etc/profile was global for environmental variables and settings...and ~/.profile was specific to the user...

and that bash.rc and ~/.bash.rc was for aliases and functions...i was trying to setup a permanent alias in my profile to a common ssh command and read that it should be going into .profile??? is it really not strict or just a rule of thumb?

What Does | Bash -s Do? Any Example?

I am trying to understand what | bash -s does

$ echo ls| bash -s sdfdsf <--- seems to be same as $echo ls |bash . What is the -s asdf doing?

Value Comparison In Bash Shell Script

I need to compare a value with different fixed value. Below is the code concept I implemented in my bash script but its giving me error.
Here "a' is the nameserver value that I extract using command line from /etc/resolv.conf. I did not put command here.

#! /bin/bash
a=1.2.3.4

if [ $a == 1.2.3.4 || 5.6.7.8 || 8.9.1.4]
then
echo " You have correct ntpserver"
else
echo"wrong ntpserver"

fi

Am I comparing the value correctly or any suggestion?

Thank you

Grep Is Not Working In RHEL5.3

Hi,

I have Redhat 5.3 running on my machine. But when I am login through putty it gives me below error.
Without running any grep command I get this error on login and the grep command doesn't work.

login as: root
root@IP's password:
Last login: Mon Feb 16 15:27:55 2015 from IP
-bash: /bin/egrep: cannot execute binary file
-bash: /bin/egrep: cannot execute binary file
-bash: /bin/egrep: cannot execute binary file
-bash: /bin/grep: cannot execute binary file
-bash: /bin/grep: cannot execute binary file
[root@bkpdrill ~]# grep MemTotal /proc/meminfo
-bash: /bin/grep: cannot execute binary file

Sh: -c: Line 1: Syntax Error Near Unexpected Token `('

Hi,
I am working with a software that is based on Perl scripting and I have encountered with a bash scripting error. So as I am not familiar with bash scripting well, I don't know how I can solve.
sh: -c: line 1: syntax error near unexpected token `('
sh: -c: line 1: ` 32(andRlooks_unw'

It should be mentioned that my $SHELL is /bin/bash. Could you please guide me what '-c' is? where is it? if I change the shebang (the #!/bin/sh part) to #!/bin/bash, the problem will be solved?

Regards,
Zahra

Good Examples Of Bash Scripts

hi guys,

i know what bash scripts are
how to make them
and how to run them...

i have written some basic scripts that
show what users are logged on
how much free disk space there is etc
backup folders with rsync
also made a menu that let me select which host i wanted
to rdp into.

could somebody post here or point to a web site that has good examples of well used bash scripts on a production server...to see what / or try to see what exactly is going on...

would really appreciate any help

How To Avoid Newlines Output In Bash Script

I am have a bash script like this:

#!/bin/bash
while true;
do
(printf %s "$(date '+%A %W %Y %X')"; echo -n ", " ; printf %s "$(ps -eo pcpu,pmem,comm | grep statsd)") >> tope.txt;
sleep 2;
done

What I want is the output of this command be entered into tope.txt like this:

Friday 20 2015 11:28:21, 0.0 0.4 /usr/libexec/systemstatsd

but what I get is output like this in multiline. :

Friday 20 2015 11:28:21
,
0.0 0.4 /usr/libexec/systemstatsd

What can I do to fix this?

Manually Downgrading Bash & GCC

Hi all,

I have a strange request. I have a system running Fedora 21. This system is now not connected to the internet (for security reasons).

I have used the " yum downgrade bash " command to revert back to version 4.3.30, but I am still receiving compilation errors in some code (which I have rescued from a Fedora Core 4 installation [don't ask!!]).

Is it possible to download the source for Bash version 3, compile and install it to test it on my Fedora 21 installation?

If so, could someone help me please, as this is something I have never tried before?

Thanks in advance for any help.

Added 'exit 0' To The Bottom Of .bashrc, Now What?

Centos 6.5

I ran into an interesting problem (on reddit) that I figured I could solve, but I have not been able to. Its simple,.. I added 'exit 0' to /root/.bashrc, and now I am trying to log in via ssh.

Everytime I do, it immediately exits when it runs the .bash_profile, which sources .bashrc, (which is immediate upon 'logging in')

I've tried:

Code:

ssh root@192.168.1.50 -t vim
vim scp://192.168.1.50/.bashrc
vim scp://192.168.1.50/root/.bashrc
ssh root@192.168.1.50 bash --norc
ssh root@192.168.1.50 /bin/bash --norc --noprofile
ssh -T root@192.168.1.50 "mv /root/.bashrc /root/.bashRC"
scp .bashrc root@192.168.1.50:/root/
ssh root@192.168.1.50 /bin/bash --norc --noprofile -vvvvvvvvvv
ssh -vvvvvv root@192.168.1.50 /bin/bash --norc --noprofile
ssh -vvvvvv root@192.168.1.50 /bin/mv /root/.bashrc /root/.bashRC
ssh -t -t root@192.168.1.50 << EOF
mv /root/.bashrc /root/.bashRC
EOF
ssh -t -t root@192.168.1.50 --norc << EOF
echo HELLO > /root/.bashrc
EOF
ssh -tv root@192.168.1.50 rm .bashrc

So,.. I am unable to get back into the system (as root, no other users exist) after adding 'exit 0' to .bashrc

Anyone feel like explaining why all of these failed (aside from saying SSH interactive logins run the .bash_profile/.bashrc files) or, offering a suggestion that works? Seems like if you have the root password, you should be allowed to modify the login process... since... you know... you are root.

W Command Certain Columns

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