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Wolfy's questions

Martin Hope
Wolfy
Asked: 2015-06-20 01:06:42 +0800 CST
  • 1

I would like to create a script that:

  1. run some commands
  2. execute sudo su - [some other username]
  3. after I exit from [some other username] -> logout

Example: test.sh

echo "test script"
sudo su
logout

If I run a script like this:

echo "test"
sudo su
whomai

I get the wanted result:

[wolfy@ubuntusrv ~ ]# ./test.sh
test
[root@ubuntusrv wolfy]# date
Fri 19 Jun 10:56:52 CEST 2015
[root@ubuntusrv wolfy]# echo bla
bla
[root@ubuntusrv wolfy]# exit
wolfy
[wolfy@ubuntusrv ~ ]#

As you can see, the script runs my echo command and then I sudo su to root, where I can do what I need to do and after I quit root session the script execute the last (whoami) command.

My problem is that I can't logout myself at the end of this script.

I need a way to do this without root privileges.

Can someone help me?

Additional explanation:

  1. when I run sudo su - username (userA) I need to provide my password (wolfy) to login as the other user (userA). Then I work for the whole session with that user (userA) and when I logout from that user (userA) I would like to automatic logout from my (wofly) user.
  2. using sudo command is not an option
command-line
Martin Hope
Wolfy
Asked: 2014-02-19 00:53:13 +0800 CST
  • 2

My friend asked me why this two simple script are not working in both shells:

Test File "abc.txt":

aaa
111
bbb
111
ccc
111
ddd

Script #1 (a):

#!/bin/sh
while read -r line ; do
    echo "Processing $line"
done < <(grep 111 abc.txt)

Output:

./a: line 4: syntax error near unexpected token `<'
./a: line 4: `done < <(grep 111 abc.txt)'

Script #2 (b):

#!/bin/bash
while read -r line ; do
    echo "Processing $line"
done < <(grep 111 abc.txt)

Output:

Processing 111
Processing 111
Processing 111

I checked bash and sh on my machine and if I understand this correct this is the same thing.

/bin/sh is just a link to /bin/bash:

-rwxr-xr-x  1 root root 938736 May 10  2012 bash
lrwxrwxrwx. 1 root root      4 Feb 13 10:20 sh -> bash

Can someone explain me where is the difference?

bash
Martin Hope
Wolfy
Asked: 2013-10-16 05:37:35 +0800 CST
  • 12

It is possible to print the result of 2 commands side by side...

Something like this

something `ls -l /a` `cat bla.txt`

result:

total 24                                                #while [ 1 = 1 ]; do
-rw-r--r-- 1 wolfy wolfy  194 Aug 13 08:50 c.in         #       echo "bla"
-rwxr-xr-x 1 wolfy wolfy   52 Sep 24 11:48 bla.sh       #done
-rwxr-xr-x 1 wolfy wolfy   38 Sep 24 11:48 bla1.sh      echo "bla"
-rwxr-xr-x 1 wolfy wolfy  147 Sep 24 11:54 ble.sh

I know that pr can do something like this with files, but I didn't find a way to do this for commands...

command-line
Martin Hope
Wolfy
Asked: 2012-09-17 22:43:59 +0800 CST
  • 8

I sometime need to check some logs and I do this with this command:

egrep -o "success|error|fail" <filename> | sort | uniq -c

Sample input:

test error on line 10
test connect success
test insert success
test started at 00:00
test delete  fail

Sample output:

1 error
1 fail
2 success

I would like to know if someone knows a way to do this with a shorter command?

Before you ask why I would like to do this with an different command... No special reason, I'm just curious :)

command-line
Martin Hope
Wolfy
Asked: 2012-06-02 00:27:11 +0800 CST
  • 2

I would like to know if there is an option to get the IP address of loged users with who command?

When I type who I get this:

wolfy@wolfy-server:~$ who

wolfy pts/0 2012-06-01 09:43 (tzu-23-764-657.sta.als.some.net)

I would like to replace "tzu-23-764-657.sta.als.some.net" with a real IP address, like in "last" command:

wolfy@wolfy-server:~$ last -i

wolfy pts/0 123.123.123.123 Fri Jun 1 09:43 still logged in

I did not find any options to do that... do you know a way to do this... maybe a different command?

command-line
Martin Hope
Wolfy
Asked: 2011-02-12 06:55:05 +0800 CST
  • 1

I run a command from my computer:

ssh user@server-name "df -hP | egrep '(/home|/cors)'"

the problem is that i get 3 more rows:

tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
/etc/bash.bashrc.local: line 9: HISTSIZE: readonly variable

What should I do, to not get this 3 rows?

Br, Wolfy

ssh
Martin Hope
Wolfy
Asked: 2010-10-20 00:41:29 +0800 CST
  • 6

Can someone tell me how can I upgrade my ubuntu server 10.04 to ubuntu server 10.10?

I try:

sudo apt-get install update-manager-core
sudo do-release-upgrade

Output:

Checking for a new ubuntu release
No new release found


sudo apt-get dist-upgrade

Output:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
10.04 10.10 server upgrade