System Adm » shell

Merge many depots

Lincoln Zuljewic Silva — Tue, 25 Aug 2009 17:58:23 +0000

When you have many depot files, you can create a single big depot and install it instead of install one by one. Let’s assume that you need install the following depots, and they are all located in the directory /tmp/install/depots:

autoconf-2.64-hppa-11.11.depot bison-2.4.1-hppa-11.11.depot gawk-3.1.7-hppa-11.11.depot sed-4.2.1-hppa-11.11.depot tcltk-8.5.7-hppa-11.11.depot texinfo-4.13-hppa-11.11.depot zip-3.0-hppa-11.11.depot

To create a single depot, run the follow commands:
# cd /tmp/install/ for i in `ls depots/*.depot` ;do swcopy -s /tmp/install/$i \* @/tmp/install/big;done

Now, to install it, you can use:
# swinstall -s /tmp/install/big

rlogin access denied

Lincoln Zuljewic Silva — Mon, 15 Jun 2009 13:54:48 +0000

In some specific situations, you need use rlogin to remote access a server, but you can face the following error:

clientServer:~ # rlogin rloginServer Password: Password: Login incorrect


	login: root

	Password:

	Login incorrect
	login: root

	Password:

	Login incorrect
	login: root

	Password:

	Login incorrect

rlogin: connection closed.

If you check the /var/log/secure log on the “rloginServer”, you will find the following messages:
Jun 15 10:44:41 rloginServer rlogind[16640]: pam_securetty(rlogin:auth): access denied: tty 'rlogin' is not secure ! Jun 15 10:44:41 rloginServer rlogind[16640]: pam_rhosts_auth(rlogin:auth): denied to root@10.11.4.9 as root: access not allowed Jun 15 10:44:47 rloginServer login: pam_securetty(remote:auth): access denied: tty 'pts/0' is not secure ! Jun 15 10:44:51 rloginServer login: FAILED LOGIN 1 FROM 10.11.4.9 FOR root, Authentication failure Jun 15 10:44:53 rloginServer login: pam_securetty(remote:auth): access denied: tty 'pts/0' is not secure ! Jun 15 10:44:58 rloginServer login: FAILED LOGIN 2 FROM 10.11.4.9 FOR root, Authentication failure Jun 15 10:44:58 rloginServer login: pam_unix(remote:auth): bad username [] Jun 15 10:44:58 rloginServer login: pam_succeed_if(remote:auth): error retrieving information about user Jun 15 10:44:58 rloginServer login: FAILED LOGIN 3 FROM 10.11.4.9 FOR , User not known to the underlying authentication module Jun 15 10:44:59 rloginServer login: pam_unix(remote:auth): bad username [] Jun 15 10:44:59 rloginServer login: pam_succeed_if(remote:auth): error retrieving information about user Jun 15 10:44:59 rloginServer login: FAILED LOGIN SESSION FROM 10.11.4.9 FOR , User not known to the underlying authentication module

The problem here, is that “rlogin” is not a “secure” shell. To configure it, you should add “rlogin” (without the quotes) to /etc/securetty .

After that, you will be able to access the rlogin server.

Setting session timeout on Linux

Lincoln Zuljewic Silva — Wed, 27 May 2009 12:41:14 +0000

To set an automatically shell timeout on Linux (that Will logoff that session after X seconds), you just need setup the following variable (put it in your /etc/profile):

# echo “TMOUT=300; readonly TMOUT; export TMOUT” >> /etc/profile

The “readonly” option will not allow an normal user change (ou unset) it.

Rotate log files in Linux

Lincoln Zuljewic Silva — Fri, 15 May 2009 21:31:43 +0000

An easy way (shell script) to rotate log files in Linux can be:

#!/bin/bash # Include the following line in crontab: #00 5 * * * /bin/rotate_logs.sh > /dev/null 2>&1 #


	DATE=`date "+%Y%m%d"`

	cd /var/log/
	for i in messages secure cron lastlog

	do

	cp ${i} ${i}.${DATE}

	> ${i}

	gzip -9 ${i}.${DATE}

	done

/etc/init.d/syslog restart

If you have any other log to rotate, you can change the line 8 and 10.

Disable CTRL+C on Linux

Lincoln Zuljewic Silva — Thu, 30 Apr 2009 18:25:39 +0000

To disable CTRL+C on Linux, you can use the following command:

# stty intr undef