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  2. List of GNU Core Utilities commands - Wikipedia

    en.wikipedia.org/wiki/List_of_GNU_Core_Utilities...

    Concatenates and prints files on the standard output cksum: Checksums (IEEE Ethernet CRC-32) and count the bytes in a file. Supersedes other *sum utilities with -a option from version 9.0. comm: Compares two sorted files line by line csplit: Splits a file into sections determined by context lines cut: Removes sections from each line of files expand

  3. QPDF - Wikipedia

    en.wikipedia.org/wiki/QPDF

    QPDF is a software library and a free command-line program that can convert one PDF file to another equivalent PDF file. It is capable of performing transformations such as linearization (also known as web optimization or fast web viewing), encryption, and decryption of PDF files. [2]

  4. fsck - Wikipedia

    en.wikipedia.org/wiki/Fsck

    Partially recovered files where the original file name cannot be reconstructed are typically recovered to a "lost+found" directory that is stored at the root of the file system. A system administrator can also run fsck manually if they believe there is a problem with the file system. The file system is normally checked while unmounted, mounted ...

  5. List of POSIX commands - Wikipedia

    en.wikipedia.org/wiki/List_of_POSIX_commands

    Change the file ownership PDP-7 UNIX cksum: Filesystem Mandatory Write file checksums and sizes 4.4BSD cmp: Filesystem Mandatory Compare two files; see also diff Version 1 AT&T UNIX comm: Text processing Mandatory Select or reject lines common to two files Version 4 AT&T UNIX command: Shell programming Mandatory Execute a simple command ...

  6. The UNIX-HATERS Handbook - Wikipedia

    en.wikipedia.org/wiki/The_UNIX-HATERS_Handbook

    Many of the book's complaints about the Unix operating system are based on design decisions and anomalies in the command-line interface. The front-matter page's dedication says: "To Ken and Dennis, without whom this book would not have been possible.", referring to Ken Thompson and Dennis Ritchie, the creators of Unix.

  7. Hidden file and hidden directory - Wikipedia

    en.wikipedia.org/wiki/Hidden_file_and_hidden...

    In DOS systems, file directory entries include a Hidden file attribute which is manipulated using the attrib command. Using the command line command dir /ah displays the files with the Hidden attribute. In addition, there is a System file attribute that can be set on a file, which also causes the file to be hidden in directory listings.

  8. patch (Unix) - Wikipedia

    en.wikipedia.org/wiki/Patch_(Unix)

    The computer tool patch is a Unix program that updates text files according to instructions contained in a separate file, called a patch file.The patch file (also called a patch for short) is a text file that consists of a list of differences and is produced by running the related diff program with the original and updated file as arguments.

  9. Extended file attributes - Wikipedia

    en.wikipedia.org/wiki/Extended_file_attributes

    macOS supports listing, [18] getting, [19] setting, [20] and removing [21] extended attributes from files or directories using a Linux-like API. From the command line, these abilities are exposed through the xattr utility. [22] Since macOS 10.5, files originating from the web are marked with com.apple.quarantine via extended file attributes. [23]