Skip to main content

Commands Related to Processes

To see currently running process 
ps
$ ps
List the process using most CPU
Top , htop
$top
To stop any process by PID i.e. to kill process
kill    {PID}
$ kill  1012
To stop processes by name i.e. to kill process
killall   {Process-name}
pkill
xkill
$ killall httpd
To get information about all running process
ps -ag
$ ps -ag
To stop all process except your shell
kill 0
$ kill 0
For background processing (With &, use to put particular command and program in background)
linux-command  &
$ ls / -R | wc -l &
To display the owner of the processes along with the processes  
ps aux
$ ps aux
To see if a particular process is running or not. For this purpose you have to use ps command in combination with the grep command

ps ax | grep  process-U-want-to see

For e.g. you want to see whether Apache web server process is running or not then give command
$ ps ax | grep httpd
To see currently running processes and other information like memory and CPU usage with real time updates.
top


$ top


Note 
that to exit from top command press q.
To display a tree of processes
pstree
$ pstree
Search  Process id of a process
pgrep
$pgrep firefox
Changing Priority of a process
 nice , renice
$renice 19 PID

Comments

Popular posts from this blog

KTU-FOSS LAB Solutions

Write shell scripts to show the following  ( you can write menu driven programs)
 Currently logged user and his logname ( logname)  Your current shell ( echo $SHELL)  Your home directory ( echo $HOME)  Your operating system type (echo $OSTYPE)  Your current path setting ( echo $PATH)  Your current working directory ( echo $PWD )  Show Currently logged  users ( w or who -H)      Show only the user name of logged users in the host ( users)      Details of last login ( last cek....where cek is the user id )  About your OS and version, release number, kernel version ( uname -a or  cat  /proc/version)  Show all available shells ( cat /etc/shells )  Show mouse settings (cat  /sys/class/input/mouse*/device/name )  Show computer CPU information       CPU details      ( cat /proc/cpuinfo | more )       Show information on  CPU architecture ( lscpu)       Number of Processor core ( nproc)  Show memory information       Memory details ( cat /proc/meminfo | more )       Display file system disk usage ( d…

Important Directories and Files

Important Directories
/bin                            holds the “essential” Linux commands and utilities /boot                          holds files required for boot process (kernel, vmlinuz, grub) /dev                            holds device files (hard drive, USB, CD-ROM, etc.) /etc                             holds system configuration files /etc/init.d                    holds scripts to start/stop network services /etc/rc.d                     holds system startup/shutdown scripts /etc/X11                      holds configuration files for X-windows /home                        holds user home directories (except for the root account) /lib                               holds system/shared library files /lost+found                holds files restored after system crash /mnt                            used as temporary mount point for CD-ROM, floppy, etc. /opt                              typically where large software applications are installed /proc                           holds kerne…

ER Diagrams to Table

REDUCING E-R DIAGRAM TO TABLE - A database which conforms to an E R diagram can be represented by collection of tables .For each entity set and for each relationship set in the database, we will create unique tables, which is assigned the name of the corresponding entity set or relationship sets . Each table has a no. of columns which have unique names. Each row in the table corresponds to an entity or a relationship.

REPRESENTATION OF STRONG ENTITY SET -Let E be a strong entity set with descriptive attributes a1, a2....aN . We represent this entity by table called E with N distinct columns, each of which corresponds to one of the attributes of E.

REPRESENTATION OF RELATIONSHIP SET - Let R be a relation ship set involving entity set E1,E2....En Let attribute(R) consists of 'm' attributes We can represent this relation ship set by a table called R with m distinct columns, each of which corresponds to one of the attributes in attribute (R) plus the primary key of E1..En.

REPRESENTI…