some least used #Linux #commands which are very important and useful

 

• chattr: The chattr command allows you to change the attributes of files and directories. This can be useful for protecting files from being modified or deleted, or for making them read-only.
• ltrace: The ltrace command allows you to trace the system calls that are made by a program. This can be useful for debugging programs or for troubleshooting performance problems.
• strace: The strace command is similar to the ltrace command, but it also traces the signals that are sent to and received by a program.
• tcpdump: The tcpdump command allows you to capture and analyze network traffic. This can be useful for troubleshooting network problems or for monitoring network activity.
• nmap: The nmap command is a network scanner that can be used to identify hosts and services on a network. This can be useful for security assessments or for network discovery.
• dig: The dig command is a DNS lookup tool that can be used to query DNS servers and retrieve DNS records. This can be useful for troubleshooting DNS problems or for learning more about the DNS hierarchy.
• hexdump: The hexdump command displays the contents of a file in hexadecimal format. This can be useful for debugging binary files or for examining the contents of a file at a low level.
• diff: The diff command compares the contents of two files and displays the differences between them. This can be useful for comparing versions of a file or for troubleshooting problems with files.
• patch: The patch command applies a patch file to a file. This can be useful for fixing bugs in a program or for updating a program to a newer version.
• make: The make command is used to build programs from source code. This can be useful for compiling programs that are not available as pre-built binaries, or for customizing programs by modifying the source code.
• grep: The grep command searches for text patterns in files. This can be useful for finding specific data in files or for filtering the output of other commands.
• awk: The awk command is a text processing tool that can be used to manipulate text files. This can be useful for extracting specific data from text files, or for performing other types of text processing tasks.

#linux
#command
#tips
#tricks
#hidden
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#useful
#important
#chattr
#ltrace
#strace
#tcpdump
#nmap
#dig
#hexdump
#diff
#patch
#make
#grep
#awk
#file
#system
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Less commonly used #Linux #commands that can be incredibly useful in specific situations

 1. rsync: This command is used for efficient file copying and synchronization between directories, even over a network. It's a powerful tool for backups and data migration.

   Example:

   bash

   rsync -av source_directory/ destination_directory/

2. tar: Tar is used for archiving files and directories into a single file, often compressed. It's a fundamental tool for creating and extracting archives.

   Example:

   bash

   tar -czvf archive.tar.gz directory_to_compress/

3. awk: Awk is a text processing tool that's especially useful for working with structured data like CSV files. It allows you to perform complex text manipulations.

   Example:

   bash

   awk -F',' '{print $1}' data.csv

4. sed: Sed (stream editor) is another text manipulation tool that's handy for search and replace operations, text transformations, and more.

   Example:

   bash

   sed 's/old_text/new_text/g' input.txt > output.txt

5. find: Find is used for searching files and directories based on various criteria such as name, size, and type. It's particularly useful for locating specific files.

   Example:

   bash

   find /path/to/search -name "*.txt"

6. grep: Grep is a powerful tool for searching text patterns within files. It's commonly used for log analysis and text extraction.

   Example:

   bash

   grep "search_text" file_to_search.txt

7. nc (netcat): Netcat is a versatile networking utility for reading from and writing to network connections. It can be used for port scanning, network testing, and more.

   Example (listening on a port):

   bash

   nc -l -p 1234

8. scp: Secure Copy Protocol (scp) allows you to securely transfer files between hosts over SSH. It's useful for remote file copying.

   Example (copying a file to a remote server):

   bash

   scp local_file.txt user@remote_server:/path/to/destination/

9. crontab: Crontab is used for scheduling tasks to run at specific times or intervals. It's essential for automating repetitive tasks.

   Example (scheduling a script to run daily at 3:00 AM):

   bash

   0 3 * * * /path/to/script.sh

10. ps: The `ps` command provides information about running processes on your system. It's helpful for monitoring and troubleshooting.

    Example (listing all processes):

    bash

    ps aux

Some Unique #command #tips and #tricks from #Linux

•  Use the fold command to wrap long lines of text. This can be useful for making text easier to read in a terminal window. For example, to wrap lines that are longer than 80 characters, you would use the following command:

fold -w 80 myfile.txt

• Use the tee command to split the output of a command into two or more streams. This can be useful for logging the output of a command to a file while also displaying it in the terminal window. For example, to log the output of the ls command to a file called mylog.txt, you would use the following command:

ls | tee mylog.txt

• Use the xargs command to execute a command on a list of files or directories. This can be useful for automating tasks such as converting files or moving them to a different location. For example, to convert all of the PDF files in a directory to JPG files, you would use the following command:

find . -name "*.pdf" | xargs -I {} convert {} {}.jpg

• Use the find command to search for files and directories based on various criteria. This can be useful for finding specific files or directories, or for finding all of the files and directories that match a certain pattern. For example, to find all of the files in a directory that have been modified in the past 24 hours, you would use the following command:

find . -mtime -1

• Use the awk command to process text files. This can be useful for extracting specific data from text files, or for performing other types of text processing tasks. For example, to print the first column of a text file, you would use the following command:

awk '{print $1}' myfile.txt