Problem : How do I list files by size?
A.At your Linux prompt
# Is -1 | sort -n + 4
Problem : How can I check the processes of two or more users?
A.Just use egrep
ps-aux | egrep ’|’
Problem : How do you splitup a file so that it will fit on floppys?
A.Use split:
# split –b 1400000
To reassemble use cat:
Cat x* >
Problem : How can I find out how much memory I am using?
A.At your Linux prompt type:
#free
Problem : How can I check how much space I am using on my hard drive(s)?
A.At your Linux prompt type:
# df
Problem : How can I check how much hard drive space a certain directory is using?
A.At your Linux prompt type:
#du –s
Problem : How do I disable unnecessary services?
On older Linux releases,services are managed by inetd.To disable inetd services,edit /etc/inetd.conf and comment out thecunwanted services by placing a # at the beginning of each line you wish disabled,and then restart inetd using the following command: kill – Hup ‘pid of inetd’.
Newer Linux releases have replaced inetd with xinetd,which is slightly different to configure.To dsable an xinetd service,edit the file /etc/xinetd.conf and add the line disable = <service> to the stanza titled “defaults” here is an example of an xinetd configuration with ftp disabled:
{
instances =60
log_type =syslog authpriv
log_on_success =HOST PID
log_on_failure =HOST
disabled =ftp
}
If you are using a separate configuration file for each service,you can also disable the service by specifying so in the service-specific file.keeping with our ftp example,you would edit /etc/xinetd.d/wu-ftpd as follows:
Service ftp
{
disable =yes
socket_type =stream
wait =no
user =root
server = /usr/sbin/in.ftpd
server_args = -1 -a
log_on_success + =DURATION USERID
log_on_failure + =USERID
nice =10
}
Once you’ve disabled the desired service,don’t forget to restart xinetd.
Ther are many unnecessary non-networking or non-inetd services,such as Ipd and linux conf.These can be disabled by reconfiguring Linux’s startup scripts.Each distribution differs sligh tly in the implementation of its startup scripts,but most distributions have a simple utility for modifying the startup scripts,such as ‘ntsysv’ in Redhat.
# ntsysv
Monitoring:
Hardware related
————————- Thanks everyone
