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nslookup: DNS Query Tool (Deprecated)
nslookup is a command-line tool used to query Domain Name System (DNS) related information. It can be used to find the IP address of a specific domain, name server information, and more. It is currently not recommended for use and has been superseded by `dig` or `host` commands.
od: Output Octal/Hexadecimal Dump of Files
The `od` command outputs the contents of a file in various formats such as octal and hexadecimal. It is a traditional tool used to analyze the contents of binary files or to check for invisible special characters in text files. It provides similar functionality to `hexdump`.
openssl: Encryption and Security Tool
OpenSSL is a powerful open-source toolkit that provides an implementation of the SSL/TLS protocol and various cryptographic functionalities. It is used for security-related tasks such as generating certificates, managing keys, and encrypting/decrypting data.
openssl-ciphers: Managing SSL/TLS Cipher List
The openssl-ciphers command is used to display and manage the list of SSL/TLS ciphers supported by the OpenSSL library. It is useful for checking the list of ciphers for a specific protocol version (e.g., SSLv3, TLSv1.2) or for validating and interpreting a cipher string.
openssl-dgst: File Hash Generation and Verification
The openssl-dgst command is used to generate and verify digital digests (hashes) of files or data using the OpenSSL library. It supports various hashing algorithms such as MD5, SHA-1, SHA-256, and is essential for data integrity checks.
openssl-dhparam: Generate and Manage Diffie-Hellman Parameters
The openssl-dhparam command is used to generate and manage parameters for Diffie-Hellman (DH) key exchange. These parameters are essential for establishing secure communication channels, particularly when using DH or DHE (Ephemeral DH) cipher suites on TLS/SSL servers. It's important to generate sufficiently large parameters for strong cryptographic communication.
openssl-ecparam: Elliptic Curve Parameter and Key Management
The openssl-ecparam command, part of the OpenSSL library, is used to generate, manipulate, and verify parameters for Elliptic Curve (EC) cryptography. It also provides the functionality to generate EC private keys based on specified elliptic curve parameters.
openssl-genrsa: Generate RSA Private Key
openssl-genrsa is part of the OpenSSL toolkit and is a command used to generate a private key for encryption using the RSA algorithm. This key is utilized in various security applications such as public-key cryptography, digital signatures, and SSL/TLS certificate generation.
openssl-rand: Generate Pseudo-Random Bytes
The openssl-rand command generates cryptographically secure pseudo-random bytes using the OpenSSL library. These random numbers can be used for various security-related purposes such as encryption keys, salts, and nonces. It operates based on the system's entropy pool and allows specifying additional entropy sources if needed.
openssl-rsa: RSA Key Management
The openssl-rsa command is used to generate, convert, and verify RSA public/private keys. As part of the OpenSSL toolkit, this command can perform various RSA key-related operations such as format conversion of key files, encryption/decryption, and public key extraction.
parted: Disk Partition Management Tool (MBR & GPT)
parted is a command-line tool for creating, modifying, and deleting disk partition tables on Linux systems. It supports both MBR and GPT partition tables, making it particularly effective for managing large-capacity disks over 2TB.
paste: Merge lines of files
The paste command merges lines from one or more files, outputting them to standard output. By default, lines from each file are separated by a tab character. This command is useful for preprocessing tasks such as combining multiple data sources or aligning data based on specific columns.