Linux commands presentation topic discrete structure.ppt

Linux Commands
• Basic commands used to interact with the
Linux operating system.
• Essential for navigating and managing files,
directories, and system processes.

ls Command
• Description: Lists files and directories in the
current directory.
• Example:
• `ls` – Lists all files and directories.
• `ls -l` – Provides detailed information including
permissions, owner, size, and modification
date.

mkdir Command
• Description: Creates a new directory.
• Example:
• `mkdir my_directory` – Creates a directory
named 'my_directory'.

rmdir Command
• Description: Removes an empty directory.
• Example:
• `rmdir my_directory` – Removes
'my_directory' if it's empty.

cd Command
• Description: Changes the current directory.
• Example:
• `cd /home/user` – Changes to the
'/home/user' directory.
• `cd ..` – Moves up one level in the directory
hierarchy.

cat Command
• Description: Displays the content of a file.
• Example:
• `cat file.txt` – Displays the content of 'file.txt'.

figlet Command
• Description: Prints text in large ASCII art.
• Example:
• `figlet Welcome` – Prints 'Welcome' in large
characters.

touch Command
• Description: Creates an empty file or updates
the timestamp of an existing file.
• Example:
• `touch newfile.txt` – Creates a file named
'newfile.txt'.

file Command
• Description: Determines the type of a file.
• Example:
• `file myfile.txt` – Displays the type of
'myfile.txt' (e.g., ASCII text).

wc Command
• Description: Counts lines, words, and
characters in a file.
• Example:
• `wc file.txt` – Displays the number of lines,
words, and characters in 'file.txt'.

sort Command
• Description: Sorts lines in a file.
• Example:
• `sort file.txt` – Sorts the lines of 'file.txt'
alphabetically.

cut Command
• Description: Cuts sections from each line of a
file.
• Example:
• `cut -d':' -f1 file.txt` – Cuts the first field
(delimited by colon) from each line of 'file.txt'.

grep Command
• Description: Searches for a pattern in a file.
• Example:
• `grep 'pattern' file.txt` – Finds all lines
containing 'pattern' in 'file.txt'.

dd Command
• Description: Converts and copies files.
• Example:
• `dd if=/dev/sda of=/backup.img` – Creates a
backup of the disk '/dev/sda'.

df Command
• Description: Shows disk space usage.
• Example:
• `df -h` – Displays disk usage in a human-
readable format.

du Command
• Description: Estimates file and directory space
usage.
• Example:
• `du -sh /home/user` – Displays the size of the
'/home/user' directory.

ulimit Command
• Description: Sets user limits for system
resources.
• Example:
• `ulimit -n 1024` – Sets the maximum number
of open files to 1024.

Linux commands presentation topic discrete structure.ppt

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