Basics of Linux

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Basics of Linux

• Gulshan Verma
• Singsys Pte. Ltd.

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Tux

• Tux The Penguin, Mascot of Linux

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• It is Unix based Operating System developed by
  community.
• Originated at 1991.
• It is free open source software (FOSS)
• The defining component of Linux is the Linux
  kernel
• Monolithic
• Micro
• The user interface, also known as the shell, is
  either a command-line interface (CLI)
• Sh simple shell
• BASH Bourne Again Shell
• KSH Korne Shell
• CSH C Shell
• SSH Secure Shell
• Text Editor VI, Emacs, gEdit, kWrite, Pico, Nano
  etc.

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Basics Commands of Linux
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Basic Commands

• ls List with filename only
• ls l List with all details
• ls a List with hidden files
• ls -la List with hidden files and details

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Basic Commands (cont)

• cd /usr/bin Open folder path
• pwd returns full path of the current directory
• which ls
• whereis ls
• locate filename
• find / something.sh
• echo
• cat filename
• cp
• mv

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Basic Commands (cont)

• mkdir
• rm
• chgrp
• chown
• chmod
• tar cvfp filename.tar /folder
• unzip filename
• tar xvfp filename.tar
• touch

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Basic Commands (cont)

• Linux TAR Command
• Create linux tar gz (Gzip) archive
• tar -czvf myarchive.tgz mydirectory/
• -c, create create a new archive
• Note that .tgz is the same thing as .tar.gz
• Create linux simple tar archive (withouth
  compresion)
• tar -cvf myarchive.tar mydirectory/
• Extracting linux tar archive
• Extract linux tar gz (Gzip) archivetar -xzvf
  mystuff.tgz
• Extract linux simple tar archivetar -xvf
  mystuff.tar
• We use -x to extract the files form the tar
  archive -x, extract, get extract files from an
  archive
• Extract linux tar archive to speciefied
  directorytar -xvzf filename.tar.gz -C
  /desired/path
• And now let us shortly explain this command
• Usage tar OPTION FILE
• Let us check the option used in this example
• -c, create                      create a new
  archive-z, gzip, ungzip        filter the
  archive through gzip-v, verbose                 
    verbosely list files processed-f,
  fileARCHIVE          use archive file or device
  ARCHIVE
• -C directory file

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File Permission
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File Permission (Cont)

• Octal numbers and permissions
• You can use octal number to represent
  mode/permission
• r 4
• w 2
• x 1
• 0rwx 0421 7
• Only Read and write permission on a file in octal
  is0rwx 0420 6
• Only read and execute permission on a file in
  octal is0rwx 0401 5
• User rwx 0421 7
• Group rwx 0420 6
• Others rwx 0001 1

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File Permission (Cont)
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Creating a crontab file

• You can create a crontab file by entering the
  following terminal command
• crontab e
• To List all the cron job
• crontab -l

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Crontab Syntax
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Crontab examples

• ltcommandgt Runs every minute 30
• ltcommandgt Runs at 30 minutes past the
  hour
• 45 6 ltcommandgt Runs at 645 am every day
• 45 18 ltcommandgt Runs at 645 pm every day
• 00 1 0 ltcommandgt Runs at 100 am every
  Sunday
• 00 1 7 ltcommandgt Runs at 100 am every
  Sunday
• 00 1 Sun ltcommandgt Runs at 100 am every
  Sunday
• 30 8 1 ltcommandgt Runs at 830 am on the
  first day of every month
• 00 0-23/2 02 07 ltcommandgt Runs every other
  hour on the 2nd of July

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Thank You!

• info_at_singsys.com
• Phone-65613900