February 2023 - ILUG-D - lists.fsci.in

1D1C - sg
by Dhanasekar 10 Feb '23

10 Feb '23

sg - execute command as different group ID To execute command as different group ID $ sg group-name -c 'command' $ sg dev-group -c 'sleep 100' $ sg admin-group -c 'ping 8.8.8.8' regards, T.Dhanasekar

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1D1C - sftp
by Dhanasekar 09 Feb '23

09 Feb '23

sftp - is a secure remote file transfer utility based on File Transfer Protocol (FTP) To Connect to SFTP $ sftp user(a)192.168.122.50 sftp> To get help commands sftp> help To Check Present Working Directory local working directory sftp> lpwd remote working directory sftp> pwd To List files with sftp On Remote sftp> ls On local machine sftp> lls To upload file using sftp sftp > put sample.py To upload multiple files using sftp sftp > mput *.py To download files using sftp sftp > get example.py To download multiple files using sftp sftp > mget *.pl To switching directories in sftp On Remote sftp > cd Documents on local machine sftp > lcd Documents To create new directory on local sftp > mkdir local_dir To create new directory on remote sftp > lmkdir remote_dir To remove directories using sftp sftp > rm file.txt sftp> rmdir dir1 To exit sftp shell sftp > exit regards, T.Dhanasekar

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1D1C - sfdisk
by Dhanasekar 08 Feb '23

08 Feb '23

sfdisk - display or manipulate a disk partition table To display partitions of all the disks in system $ sudo sfdisk -l To view disk partitions of a specific device $ sudo sfdisk -l /dev/vda To display Total Partition Size $ sudo sfdisk -s To display Partition size of specific partition $ sudo sfdisk -s /dev/vda To dump disk partition details to text file $ sudo sfdisk -d /dev/vda > vda.out To display Disk Geometry for Debugging $ sudo sfdisk -G To display the kernel’s idea of the geometry of the device $ sudo sfdisk -g To display All Disk Partition types $ sudo sfdisk -T To display the partition type of a specific partition $ sudo sfdisk --print-id /dev/vda 1 regards, T.Dhanasekar

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1D1C - setsid
by Dhanasekar 07 Feb '23

07 Feb '23

setsid - run a program in a new session syntax $ setsid [options] program [arguments] $ cat add.sh #!/bin/bash # Take input from user and calculate sum. read -p "Enter first number: " num1 read -p "Enter second number: " num2 sum=$(( $num1 + $num2 )) echo "Sum is: $sum" :x To execute shell script in a new session. $ sudo setsid ./add.sh To set the controlling terminal to the current one. $ sudo setsid -c ./add.sh To 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 ./add.sh regards, T.Dhanasekar

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1D1C - setfacl
by Dhanasekar 06 Feb '23

06 Feb '23

setfacl - set file access control lists syntax $ setfacl option file To modify ACLs of file to give read and write permission to user1 $ setfacl -m u:user1 rw file To remove all extended ACL entries $ setfacl -b file.txt To remove entries from the ACL of file, To remove group 'ilugc' from a file's ACL $ setfacl -x g:ilugc file.txt To remove the default ACL $ setfacl -k file To apply operations to all files and directories recursively $ setfacl -m g:ilugc:rw -R directory To restore a permission backup $ setfacl --restore=file To copy the ACL of one file to another $ getfacl example.txt | setfacl --set-file=- f sample.txt regards, T.Dhanasekar

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1D1C - set
by Dhanasekar 05 Feb '23

05 Feb '23

set - is a built-in Linux shell command that displays and sets the names and values of shell and Linux environment variables syntax $ set [options] [arguments] To list all settings $ set $ set debian redhat arch To list all the parameters in the order of $1 $2 $3 $ echo "$*" $ echo $1 $ echo $2 $ echo $3 To unset All Positional Parameters $ set -- To print out an error on the shell if the script runs into an undefined variable $ vim example1.sh #!/bin/bash set -u echo $foo echo "welcome to ilugc" :x $ bash example.sh To display an Error If a Command Is Non-existent $ vim example2.sh #!/bin/bash set -e foo bar echo "welcome to klug" :x $ bash example2.sh To Display an Error in Piped Commands $ vim example3.sh #!/bin/bash set -eo pipefail foobar | echo "Hi welcome to chennaipy" echo "welcome to ilugc" :x $ bash example3.sh To set allexport and notify options $ set -o allexport -o notify regards, T.Dhanasekar

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1D1C - service
by Dhanasekar 04 Feb '23

04 Feb '23

service - is used to control SysVinit services through SysVinit scripts syntax $ service [options] [service] [subcommand] To check the status of service $ sudo service rsyslog status $ sudo service sshd status To stop a service $ sudo service rsyslog stop $ sudo service sshd stop To restart a service $ sudo service rsyslog restart $ sudo service sshd restart $ sudo service vsftpd restart To list the status for all the programs $ sudo service --status-all To do a full restart $ sudo service service_name --full-restart regards, T.Dhanasekar

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1D1C - seq
by Dhanasekar 03 Feb '23

03 Feb '23

seq - print a sequence of numbers syntax $ seq [option] FIRST INCREMENT LAST To display Seq LAST , default increment is 1 $ seq 20 To print with Seq FIRST and LAST $ seq 5 20 To print Seq FIRST INCREMENT LAST $ seq 4 2 50 To add the strings before the sequence number $ seq -f NUM%02g 10 To print the formatted strings starting from 5 and incrementing by 5 up to 25 $ seq -f NUM%02g 5 5 25 To display the output on the same line $ seq -s " " 5 5 50 To append the leading zeros to equalize the width $ seq -ws " " 3 2 120 To display with separators $ seq -s - 100 To generate a sequence containing the floating values $ seq -f "%f" 2 0.5 10 regards, T.Dhanasekar

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ILUG-D February 2023