- ILUG-D - lists.fsci.in

1D1C - yum
by Dhanasekar 26 Jun '23

26 Jun '23

yum ( Yellowdog Updater Modified ) - is an interactive, rpm based, package manager To search for a package $ sudo yum search <package_name> $ sudo yum search htop To install package $ sudo yum install <package_name> $ sudo yum install htop To remove a package $ sudo yum remove <package_name> $ sudo yum remove bind To update a package $ sudo yum update <package_name> $ sudo yum update firefox To list a package $ sudo yum list <package_name> $ sudo yum list httpd To get information about a package $ sudo yum info <package_name> $ sudo yum info openssh To list all available packages $ sudo yum list To list all installed packages $ sudo yum list installed To find which package a specific file belongs to $ sudo yum provides /etc/vsftpd/vsftpd.conf To check for available updates $ sudo yum check-update To update the system $ sudo yum update To list all available group packages $ sudo yum grouplist To install group packages $ sudo yum groupinstall "Development Tools" To update a group packages $ sudo yum groupupdate 'Development Tools' To remove group packages $ sudo yum groupremove 'Development Tools' To list enabled Yum repositories $ sudo yum repolist To list all enabled and disabled Yum repositories $ sudo yum repolist all To invoke yum shell $ sudo yum shell > info httpd To clean Yum cache $ sudo yum clean all To view history of Yum $ sudo yum history To read commands from text file and execute $ cat yum_command.txt info httpd repolist $ sudo yum shell yum_command.txt regards, T.Dhanasekar

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1D1C - whois
by Dhanasekar 25 Jun '23

25 Jun '23

whois - client for the whois directory service To Find IP Address Information $ whois 216.58.206.46 To Find Domain Information $ whois ilugc.in $ whois chennaipy.org To find the Registry expiration date of a domain $ whois <domain name> | grep 'Registry Expiry Date:' $ whois ilugc.in | grep 'Registry Expiry Date:' $ whois linuxdelhi.org | grep 'Registry Expiry Date:' $ whois chennaipy.org | grep 'Registry Expiry Date:' regards, T.Dhanasekar

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1D1C - setsid
by Dhanasekar 24 Jun '23

24 Jun '23

setsid - is used to run a program in a new session To show the help options $ setsid -h To set the controlling terminal to the current one $ setsid -c ./sample.sh To Execute a program even after log out $ setsid ./example-script.sh To make wait for the execution of the program to end and return the exit value of this program as the return value of setsid $ setsid -w ./sample.sh regards, T.Dhanasekar

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1D1C - openssl-rand
by Dhanasekar 23 Jun '23

23 Jun '23

openssl-rand - generate pseudo-random bytes To generate the password using openssl-rand $ openssl rand -base64 7 $ openssl rand -base64 10 regards, T.Dhanasekar

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1D1C - makepasswd
by Dhanasekar 22 Jun '23

22 Jun '23

makepasswd - generate and/or encrypt passwords To generate passwords by default without any options $ makepasswd To generate passwords by desired count and length $ makepasswd --chars=10 --count=10 $ makepasswd --chars=12 --count=16 $ makepasswd --chars=12 --count=20 regards, T.Dhanasekar

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1D1C - urandom
by Dhanasekar 21 Jun '23

21 Jun '23

urandom - kernel random number source devices To generate password of length “15” $ head -c 15 /dev/urandom | base64 To generate password of length "30" $ head -c 30 /dev/urandom | base64 regards, T.Dhanasekar

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1D1C - resolvectl
by Dhanasekar 20 Jun '23

20 Jun '23

resolvctl - it is used to manage and troubleshoot the Domain Name System To view DNS settings # resolvectl status To resolve the IPv4 and IPv6 addresses for one or more domains # resolvectl query domain1 domain2 To retrieve the domain of a specified IP # resolvectl query <ip_address> To retrieve an MX record of domain # resolvectl --legend=no --type=MX query domain_name regards, T.Dhanasekar

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1D1C - xkcdpass
by Dhanasekar 19 Jun '23

19 Jun '23

xkcdpass - generate memorable, secure multiword passphrases To generate 6 password phrases $ xkcdpass To generate 5 password phrases with delimiter $ xkcdpass -n 5 --delimiter='|' $ xkcdpass -n 5 --delimiter=':' regards, T.Dhanasekar

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1D1C - diceware
by Dhanasekar 18 Jun '23

18 Jun '23

diceware - it generates passphrases by concatenating words randomly picked from wordlists To generate passphrase $ diceware To add delimiters between words $ diceware -d'#' $ diceware -d'-' $ diceware -d'&' regards, T.Dhanasekar

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1D1C - pwgen
by Dhanasekar 17 Jun '23

17 Jun '23

pwgen - generate pronounceable passwords To generate password with secure 30 character length $ pwgen -s 30 To generate password with mix of special characters $ pwgen -y 10 To create password with mix of Capital letters $ pwgen -c 10 regards, T.Dhanasekar

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