# id ---------- Show the active user id with login and group
# id username ---------- Shows details for a particular user
# last ----------- Show last logins on the system
# who --------- Show who is logged on the system
# who -u ------- shows the pid also of the logged in user, so easy to kill that particular user only. # kill -9 PID
# useradd -c "Colin Barschel" -g admin -m colin ----- all in one line
# ulimit -a
The shell limits are governed by ulimit. The status is checked with ulimit -a,
To change the open files limit from 1024 to 10240 do:
# ulimit -n 10240 , This is only valid within the shell.
Login users and applications can be configured in /etc/security/limits.conf
# cat /etc/security/limits.conf
* hard nproc 250 # Limit user processes
asterisk hard nofile 409600 # Limit application open files
Use chkconfig to configure the programs that will be started at boot in a runlevel.
# chkconfig --list ------- List all init scripts
# chkconfig --list sshd ----- Report the status of sshd
# chkconfig sshd --level 35 on ------ Configure sshd for levels 3 and 5
# chkconfig sshd off -------- Disable sshd for all runlevels
# id username ---------- Shows details for a particular user
# last ----------- Show last logins on the system
# who --------- Show who is logged on the system
# who -u ------- shows the pid also of the logged in user, so easy to kill that particular user only. # kill -9 PID
# useradd -c "Colin Barschel" -g admin -m colin ----- all in one line
# ulimit -a
The shell limits are governed by ulimit. The status is checked with ulimit -a,
To change the open files limit from 1024 to 10240 do:
# ulimit -n 10240 , This is only valid within the shell.
Login users and applications can be configured in /etc/security/limits.conf
# cat /etc/security/limits.conf
* hard nproc 250 # Limit user processes
asterisk hard nofile 409600 # Limit application open files
Use chkconfig to configure the programs that will be started at boot in a runlevel.
# chkconfig --list ------- List all init scripts
# chkconfig --list sshd ----- Report the status of sshd
# chkconfig sshd --level 35 on ------ Configure sshd for levels 3 and 5
# chkconfig sshd off -------- Disable sshd for all runlevels
Some Kernel Modules
# lsmod -------- List all modules loaded in the kernel
# rmmode -------- To remove a module
# modprobe usb-storage --------- To load a module
# insmod ----- To load a module
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