explodepkg, pkgdiff, pkgtool, upgradepkg: add pages (#19984)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/linux/explodepkg.md

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+# explodepkg
+
+> Extract the contents of a Slackware package to the current directory.
+> See also: `installpkg`, `removepkg`, `upgradepkg`, `makepkg`, `pkgtool`.
+> More information: <https://www.slackbook.org/html/book.html#PACKAGE-MANAGEMENT-EXPLODEPKG>.
+
+- Extract a package to the current directory:
+
+`explodepkg {{path/to/package.tgz}}`
+
+- Extract multiple packages to the current directory:
+
+`explodepkg {{path/to/package1.tgz}} {{path/to/package2.tgz}}`

pages/linux/pkgdiff.md

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+# pkgdiff
+
+> Compare the file contents of two Slackware packages.
+> More information: <https://slackware.nl/slackware/slackware64-current/source/a/pkgtools/manpages/pkgdiff.8>.
+
+- Compare two packages and display differences:
+
+`pkgdiff {{path/to/package1.txz}} {{path/to/package2.txz}}`
+
+- Compare two packages with colorized output:
+
+`pkgdiff -c {{path/to/package1.txz}} {{path/to/package2.txz}}`
+
+- Compare two packages and output a simple unified diff:
+
+`pkgdiff -a {{path/to/package1.txz}} {{path/to/package2.txz}}`

pages/linux/pkgtool.md

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+# pkgtool
+
+> Interactive menu-driven tool for managing Slackware packages.
+> See also: `installpkg`, `removepkg`, `upgradepkg`, `makepkg`.
+> More information: <https://www.slackbook.org/html/book.html#PACKAGE-MANAGEMENT-PACKAGE-UTILITIES-PKGTOOL>.
+
+- Launch the interactive package tool:
+
+`sudo pkgtool`
+
+- Remove packages interactively:
+
+`sudo pkgtool --remove_menu`
+
+- View installed packages:
+
+`pkgtool --view_menu`
+
+- Install packages from the current directory:
+
+`sudo pkgtool --install_menu`
+
+- Set up packages interactively (run doinst.sh scripts):
+
+`sudo pkgtool --setup_menu`

pages/linux/upgradepkg.md

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+# upgradepkg
+
+> Upgrade Slackware packages by replacing existing packages with new versions.
+> See also: `installpkg`, `removepkg`, `makepkg`, `pkgtool`.
+> More information: <https://slackware.nl/slackware/slackware64-current/source/a/pkgtools/manpages/upgradepkg.8>.
+
+- Upgrade a package:
+
+`sudo upgradepkg {{path/to/package.tgz}}`
+
+- Upgrade a package, installing it if not already present:
+
+`sudo upgradepkg --install-new {{path/to/package.tgz}}`
+
+- Reinstall a package (even if the same version is already installed):
+
+`sudo upgradepkg --reinstall {{path/to/package.tgz}}`
+
+- Preview what would happen without actually upgrading:
+
+`upgradepkg --dry-run {{path/to/package.tgz}}`
+
+- Upgrade a package and show detailed progress:
+
+`sudo upgradepkg --verbose {{path/to/package.tgz}}`