/usr/bin/python will point to Python 3. No, this is not going to happen (unless PEP 394 advocates otherwise, which is doubtful for the foreseeable future). /usr/bin/python and /usr/bin/python2 will point to Python 2.7 and /usr/bin/python3 will point to the latest supported Python 3 version.
Symbolic links operate transparently for many operations: programs that read or write to files named by a symbolic link will behave as if operating directly on the target file. However, they have the effect of changing an otherwise hierarchic filesystem from a tree into a directed graph, which can have consequences for such simple operations as determining the current directory of a process. Even the Unix standard for navigating to a directory's parent directory no longer works reliably in the face of symlinks. Some shells heuristically try to uphold the illusion of a tree-shaped hierarchy, but when they do, this causes them to produce different results from other programs that manipulate pathnames without such heuristic, relying on the operating system instead.[5]Programs that need to handle symbolic links specially (e.g., shells and backup utilities) thus need to identify and manipulate them directly.
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In POSIX-compliant operating systems, symbolic links are created with the symlink[6] system call. The ln shell command normally uses the link[7] system call, which creates a hard link. When the ln -s flag is specified, the symlink() system call is used instead, creating a symbolic link. Symlinks were introduced in 4.1c.1 BSD Unix from U.C. Berkeley.[citation needed]
This method was slow and an inefficient use of disk-space on small systems. An improvement, called fast symlinks, allowed storage of the target path within the data structures used for storing file information on disk (inodes). This space normally stores a list of disk block addresses allocated to a file. Thus, symlinks with short target paths are accessed quickly. Systems with fast symlinks often fall back to using the original method if the target path exceeds the available inode space. The original style is retroactively termed a slow symlink. It is also used for disk compatibility with other or older versions of operating systems.
Although storing the link value inside the inode saves a disk block and a disk read, the operating system still needs to parse the path name in the link, which always requires reading additional inodes and generally requires reading other, and potentially many, directories, processing both the list of files and the inodes of each of them until it finds a match with the link's path components. Only when a link points to a file in the same directory do "fast symlinks" provide significantly better performance than other symlinks.
The vast majority of POSIX-compliant implementations use fast symlinks. However, the POSIX standard does not require the entire set of file status information common to regular files to be implemented for symlinks. This allows implementations to use other solutions, such as storing symlink data in directory entries.
Cygwin simulates POSIX-compliant symbolic links in the Microsoft Windows file system. It uses identical programming and user utility interfaces as Unix (see above), but creates Windows shortcuts (.lnk files) with additional information used by Cygwin at the time of symlink resolution. Cygwin symlinks are compliant with the POSIX standard in terms of how they are resolved, and with Windows standards in terms of their on-disk representation.
Greetings, I've tried putting this into configuration to fix symlinks for windows for my setup , but I am not sure if it will affect windows client, otherwise it follows symlinks when I connect to this box.
But, AppArmor blocks access to parts of the file system according to its own ruleset semantics. So, if your symlink within Samba pointed to a location which AppArmor would block, Samba would deny access.
On my system, Samba updates AppArmor profiles on the service start/stop, so I could change an AppArmor profile, but risk Samba or another program overwriting it. Instead, I decided to create an inaccessible share in Samba referencing the location which contained the symlink target I wanted to access (still in smb.conf):
Many users have dozens of Python interpreters on their computer already, but have no idea how to manage them effectively. Too often, people just download the latest Python release, move it to their path, and call it a day (or use brew install python3, which would do something similar). This can cause breakages down the line in frustrating ways that can be difficult to troubleshoot.
Okay, great! The Homebrew maintainers have updated the default Python bottle to point to the latest release. Since the Homebrew maintainers are more dependable at updating the release than most of us, we can use Homebrew's version of Python 3 with the following command:
I would like to change the modified date of a symlink. The symlink points to a directory so it cannot be a hardlink.The following command works fine in the terminal for an actual directory, but it does not modify the modified date on the symlink. How can I do this and why does the command not work on symlinks?
To invoke the AWS SAM CLI with the sam command, the installer automatically creates a symlink between /usr/local/bin/sam and either /usr/local/aws-sam-cli/sam or the installation folder you chose.
To invoke the AWS SAM CLI with the sam command, you must manually create a symlink between the AWS SAM CLI program and your $PATH. Create your symlink by modifying and running the following command:
This YAML differs from the previous one in two specific ways. The first is on line 11. It mounts the Docker socket. In this case, it is a Podman socket; more specifically, it is a symlink to the Podman socket. For this example to work unchanged, we need to ensure SELinux is disabled by temporarily setting setenforce to 0. The second interesting difference is on line 15. The moniker of build indicates that Compose should use a Dockerfile to build the image in question.
Latest versions of Samba no longer offer older authentication methods and protocols which are still used by some older clients (IP cameras, etc). These devices usually require Samba server to allow NTMLv1 authentication and NT1 version of the protocol, known as CIFS. For these devices to work with latest Samba, you need to add these two configuration parameters into [global] section:
Pages that refer to this page: column(1), find(1), namei(1), stat(2), statx(2), glob(3), strverscmp(3), core(5), dir_colors(5), passwd(5), proc(5), mq_overview(7), symlink(7), lsblk(8), lsof(8), setfiles(8)
When a recipe sets SRCREV to$AUTOREV, the build system accesses the network in anattempt to determine the latest version of software from the SCM.Typically, recipes that use AUTOREV are custom or modifiedrecipes. Recipes that reside in public repositories usually do notuse AUTOREV.
It follows that packaging an unversioned library requires a bit of work in therecipe. By default, libfoo.so gets packaged into $PN-dev, whichtriggers a QA warning that a non-symlink library is in a -dev package,and binaries in the same recipe link to the library in $PN-dev,which triggers more QA warnings. To solve this problem, you need to package theunversioned library into $PN where it belongs. The following are the abridgeddefault FILES variables in bitbake.conf:
SOLIBS defines a pattern that matches real shared object libraries.SOLIBSDEV matches the development form (unversioned symlink). These twovariables are then used in FILES:$PN and FILES:$PN-dev, which putsthe real libraries into $PN and the unversioned symbolic link into $PN-dev.To package unversioned libraries, you need to modify the variables in the recipeas follows:
When fetching a repository, BitBake uses theSRCREV variable to determinethe specific source code revision from which to build. You set theSRCREV variable toAUTOREV to cause theOpenEmbedded build system to automatically use the latest revision ofthe software:
The history for each package contains a text file that has name-valuepairs with information about the package. For example,buildhistory/packages/i586-poky-linux/busybox/busybox/latestcontains the following:
Finally, for those recipes fetched from a version control system (e.g.,Git), there is a file that lists source revisions that are specified inthe recipe and the actual revisions used during the build. Listedand actual revisions might differ whenSRCREV is set to$AUTOREV. Here is anexample assumingbuildhistory/packages/qemux86-poky-linux/linux-yocto/latest_srcrev):
log.do_taskname and run.do_taskname are actually symboliclinks to log.do_taskname.pid andlog.run_taskname.pid, where pid is the PID the task hadwhen it ran. The symlinks always point to the files corresponding to themost recent run.
By default, the SEP client for Linux does not scan symbolic links, commonly referred to as symlinks or soft links. This is a change in the scanning behavior from Symantec Antivirus (SAV) for Linux, which scanned symbolic links by default. See Enabling the scanning of symbolic links in Symantec Endpoint Protection for Linux for more information.
Oracle recommends that the JDK is updated with each Critical Patch Update.In order to determine if a release is the latest, the Security Baseline page canbe used to determine which is the latest version for each release family. 2ff7e9595c
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