- ILUG-D - lists.fsci.in

1D1C - valgrind
by Dhanasekar 07 Jul '23

07 Jul '23

valgrind - it is a flexible program for debugging and profiling programs To debug and profiling a sample program $ valgrind ./sample_program To detect memory leaks $ valgrind --leak-check=full --show-leak-kinds=all ./sample_program To get more detailed memory-leak output $ valgrind --leak-check=full ./sample_program regards, T.Dhanasekar

1 0

1D1C - ltrace
by Dhanasekar 05 Jul '23

05 Jul '23

ltrace - A library call tracer. it is used to intercept and record dynamic calls to shared libraries on the system To trace a program in creating somefiles using touch command $ ltrace touch a.txt b.txt c.txt To trace program by its process id $ ltrace -p <pid_of_process> regards, T.Dhanasekar

1 0

1D1C - flatpak
by Dhanasekar 04 Jul '23

04 Jul '23

flatpak - is a tool for managing applications and the runtimes they use To check flatpak version $ flatpak --version To List all the Packages $ flatpak list To search a package $ flatpak search <package_name> To Install a package $ flatpak install <package_name> To uninstall a package $ flatpak uninstall <package_name> To check flatpak history $ flatpak history To update package $ flatpak update <package_name> To check all the Information $ flatpak info <package_name> To check flatpak process $ flatpak ps To kill flatpak process $ flatpak kill <process_name> To repair flatpak installation $ flatpak repair To print help options $ flatpak --help regards, T.Dhanasekar

1 0

1D1C - pacman
by Dhanasekar 03 Jul '23

03 Jul '23

pacman - is the software package manager for Arch Linux To install the package $ sudo pacman -S package_name To install multiple packages $ sudo pacman -S package1 package2 package3 To upgrade the system $ sudo pacman -Suy To update the package databases $ sudo pacman -Syy To search for the package $ sudo pacman -Ss <package_name> To show package information $ sudo pacman -Si <package_name> To search for installed packages $ sudo pacman -Qs <package_name> To download the package $ sudo pacman -Sw <package_name> To install the downloaded package $ sudo pacman -U <package_name_file> To install the package from a url $ sudo pacman -U <package_url> To uninstall the package $ sudo pacman -Rs <package_name> To list all installed packages $ sudo pacman -Q To view details of an installed package $ sudo pacman -Qi <package_name> To clean the package cache $ sudo pacman -Sc regards, T.Dhanasekar

1 0

1D1C - zypper
by Dhanasekar 02 Jul '23

02 Jul '23

Zypper - is a command line tool for package management in OpenSUSE and SUSE Enterprise Linux platforms To Install a Package $ sudo zypper install <package Name> To update a package $ sudo zypper update httpd To upgrade all the packages $ sudo zypper update To view all the available updates $ sudo zypper list-updates For a full distribution upgrade $ sudo zypper dup To delete a package $ sudo zypper remove <package_name> To search for a specific package $ sudo zypper search <package_name> To view details about a package $ sudo zypper info htop To install patches $ sudo zypper patches To lock a specific package it prevents not remove, upgrade the package $ sudo zypper al <package_name> To list the locked packages $ sudo zypper ll To remove lock from a package $ sudo zypper rl <package_name> To view repositories $ sudo zypper lr To view complete URI for the repo $ sudo zypper lr --uri regards, T.Dhanasekar

1 0

1D1C - firewall-cmd
by Dhanasekar 01 Jul '23

01 Jul '23

firewall-cmd - is the command line client of the firewalld daemon To verify the status of the firewall service $ sudo firewall-cmd --state To check all the available zones in firewalld $ sudo firewall-cmd --get-zones To find out which is the default zone $ sudo firewall-cmd --get-default-zone To find a list of active zones and associated network interfaces $ sudo firewall-cmd --get-active-zones To find out if there are any rules listed in the active public zone $ sudo firewall-cmd --list-all --zone="public" To check the list of all available zones $ sudo firewall-cmd --list-all-zones To list all the available services in firewalld $ sudo firewall-cmd --get-services To add an existing service to the default zone $ sudo firewall-cmd --add-service=https To add a service permanently $ sudo firewall-cmd --permanent --add-service=https To reload the firewall $ sudo firewall-cmd --reload To migrate runtime settings to permanent $ sudo firewall-cmd --runtime-to-permanent To open a port in the public zone $ sudo firewall-cmd --zone=public --add-port=<port_number>/udp $ sudo firewall-cmd --zone=public --add-port=<port_number>/tcp $ sudo firewall-cmd --zone=public --add-port=53/udp $ sudo firewall-cmd --zone=public --add-port=53/tcp To list open ports in firewalld $ sudo firewall-cmd --list-ports To display help options $ firewall-cmd --help To close or remove a port $ sudo firewall-cmd --remove-port=5432/tcp $ sudo firewall-cmd --reload To list all rules $ sudo firewall-cmd --list-all To allow access to port 5432 only from IP 192.168.122.200 $ sudo firewall-cmd --permanent --zone=public --add-rich-rule 'rule family="ipv4" source address="192.168.122.200" port port=5432 protocol=tcp accept' regards, T.Dhanasekar

1 0

1D1C - dnf
by Dhanasekar 30 Jun '23

30 Jun '23

dnf - Dandified YUM is a fork of YUM package manager To install package $ sudo dnf install <package_name> $ sudo dnf install httpd To list all repositories $ sudo dnf repolist all To list enabled repositories $ sudo dnf repolist To remove package $ sudo dnf remove <package_name> $ sudo dnf remove vsftpd $ sudo dnf erase vsftpd To update a package $ sudo dnf update firefox To check for full system update $ sudo dnf check-update To upgrade all system packages $ sudo dnf upgrade To list all group packages $ sudo dnf grouplist To Install group packages $ sudo dnf groupinstall "Development Tools" To Remove group packages $ sudo dnf groupremove "Development Tools" To search for packages $ sudo dnf search httpd To download only package and not to install $ sudo dnf download bind To show all available packages $ sudo dnf list available To show only installed package $ sudo dnf list installed To show all installed as well as available packages $ sudo dnf list To enable repo for installation $ sudo dnf install --enablerepo=epel mariadb To check which package provides the required function $ sudo dnf provides httpd $ sudo dnf provides /etc/vsftpd/vsftpd.conf To view package information $ sudo dnf info htop To create a cache manually $ sudo time dnf makecache To delete a cache $ sudo dnf clean all To check the transaction history $ sudo dnf history To remove orphan packages $ sudo dnf autoremove To synchronize all the packages to latest stable releases $ sudo dnf distro-sync To reinstall a package $ sudo dnf reinstall firefox To upgrade to a particular version $ sudo dnf upgrade-to httpd-<version> regards, T.Dhanasekar

1 0

1D1C - sar
by Dhanasekar 29 Jun '23

29 Jun '23

sar - Collect, report, or save system activity information. syntax $ sar [option] [interval] [count] To display the CPU utilization report. $ sar -u $ sar -u ALL To report CPU utilization for each n seconds $ sar -u 3 $ sar -u 10 To display memory utilization statistics $ sar -r To display I/O and transfer rate statistics $ sar -b To display statistics for the specified processor $ sar -P 0 To reports statistics for each individual processor, and globally for all processors $ sar -P ALL To view swap space utilization statistics $ sar -S To display 4 swap space utilization reports for every 3 seconds $ sar -S 2 4 To display memory swapping statistics $ sar -W To display filesystems statistics $ sar -F 2 4 To report network statistics $ sar -n SOCK $ sar -n DEV To display all network statistics $ sar -n ALL To display block devices statistics $ sar -d To display queue length and load averages $ sar -q To display paging statistics $ sar -B To report task creation and system switching activity $ sar -w 2 4 To report about kernel tables $ sar -v 2 4 To display all statistics $ sar -A regards, T.Dhanasekar

1 0

1D1C - wdctl
by Dhanasekar 28 Jun '23

28 Jun '23

wdctl - show hardware watchdog status To display the watchdog status $ wdctl To print raw output format $ wdctl -r To print help options $ wdctl -h To print the watchdog status in a single line in key-value pairs $ wdctl --oneline regards, T.Dhanasekar

1 0

1D1C - whiptail
by Dhanasekar 27 Jun '23

27 Jun '23

whiptail - is a program that will let you present a variety of questions or display messages using dialog boxes from a shell script To display a simple message $ whiptail --title "ILUGC" --msgbox "message" 5 15 To display a boolean choice $ whiptail --title "Learn Linux" --yesno "ILUGC" 5 20 To customise the text on the yes / no buttons $ whiptail --title "FOSS" --yes-button "choose Ubuntu" --no-button "Choose Centos" --yesno "message" 5 50 To display a text input box $ result_variable_name="$(whiptail --title "FOSS" --inputbox "message" 5 20 3>&1 1>&2 2>&3)" To display a password input box $ result_variable_name="$(whiptail --title "password" --passwordbox "message" 5 20 3>&1 1>&2 2>&3)" To display a multiple-choice menu $ result_variable_name=$(whiptail --title "title" --menu "message" 20 50 10 "option1" "ubuntu" "option2" "debian" "option3" "centos" 3>&1 1>&2 2>&3) regards, T.Dhanasekar

1 0

2025

2024

2023

2022

2021

ILUG-D