Search files for a string in linux

Use grep
example, look for the text hsbc in the /srv/www/ location

# grep -r -l "hsbc" /srv/www/

Apache web service wont start after restart, apache2 error "Address already in use"

If you stopped or restarted the apache2 server service and it failed to start this article should help.

You might type the command: rcapache2 start

You might get an error like this:

Starting httpd2 (prefork) (98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
startproc:  exit status of parent of /usr/sbin/httpd2-prefork: 1               ...        failed


Try this:

Run each of these commands

for i in `ps auwx | grep -i nobody | awk {'print $2'}`; do kill -9 $i; done
for i in `lsof -i :80 | grep http | awk {' print $2'}`; do kill -9 $i; done
for i in `lsof -i :80 | grep http | awk {' print $2'}`; do kill -9 $i; done

then run
service httpd restart
or run
 rcapache2 start



Until next time
thanks

P.S. like anything else on this blog, the instructions are 'as is' and use art your own risk.

Mysql ODBC connection to Linux Mysql database

If you have a database user that needs and ODBC connection to a mysql database, you create a user name and password, then before they can connect you need to add that user's computer IP address to linux to enable or allow access. By default, MySQL does not allow remote clients to connect to the MySQL database and your user is likely connecting remotely.

Use this code:

use mysql
GRANT ALL ON *.* to USERNAME @'10.30.1.2' IDENTIFIED BY 'PASSWORD';
FLUSH PRIVILEGES;

Replace the USERNAME  and PASSWORD with your actual values.

Also, update firewall rules to make sure port# 3306 is open on the server that is running the mysql database.



remember, first you need to login to mysql

$ mysql -u root -p
Enter password:

Find the Size of Directory in Suse Linux

Try these


du -h ./


For the most part this works. If you have spaces in file/directory
names than you may get some errors, but I'm sure you can work around
those if needed:

ls -1drt *| xargs du -h --summarize



You could also try

du -hc --max-depth=1

This will give you all the directories in the current directory, and a total at the bottom. Play with the --max-depth to dig down further in the structure and get more fine-grained results.

You can run this with a pipe to grep "G" to do a quick search of folders that are large enough to be measured in gigabytes. It will pull any directories with a capital G in them, but there aren't many of those so it works for me.

du -hc --max-depth=1 | grep "G"

Where's the php.ini file

/etc/php.ini

Or here:

/etc/php/php.ini
/etc/php5/php.ini

Or here:

/usr/bin/php5/bin/php.ini

Anyway, you can always find any file named php.ini in this manner

find / -name php.ini

The simplest yet most powerful usage of the renowned find command. By its help I was able to locate the php.ini on my Ubuntu 9.04 Apache2 and PHP5:

/etc/php5/apache2/php.ini

Show Processes Running on Linux, RAM process usage

ps command

Type the following ps command to display all running process:
# ps aux | less
Where,

• -A: select all processes
• a: select all processes on a terminal, including those of other users
• x: select processes without controlling ttys

Task: see every process on the system

# ps -A
# ps -e

Task: See every process except those running as root

# ps -U root -u root -N

Task: See process run by user vivek

# ps -u vivek

Task: top command

The top program provides a dynamic real-time view of a running system. Type the top at command prompt:
# top

Free Disk Space / Disk usage on Linux

Q. How do I check free disk space in Linux or UNIX operating system? I've migrated from Windows NT to Linux and looking forward to get more information about free disk space.

A. Both Linux and UNIX offers two commands for checking out free disk space:

(a) df command : Report file system disk space usage

(b) du command : Estimate file space usage

df command examples - to check free disk space

Type df -h or df -k to list free disk space:
$ df -h
OR
$ df -k

Examples

linuxServer:/ # df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda2            109038804  82892008  20610028  81% /
udev                   3864264        92   3864172   1% /dev
/dev/sda3             10079572   5955024   3612484  63% /home


or you can run this command to get the file sizes at depth 1
# du -hc --max-depth=1


Thanks