How to check if i have symbolic math toolbox
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Very often the unlink and ln commands are used together if we want to point a symlink to a different directory. Ls: cannot access complex_path: No such file or directory You can remove it using the unlink command: cd /opt/scripts/ What happens if you don’t need a symbolic link anymore? rw-rw-r- 1 ec2-user ec2-user 22 Mar 17 23:54 test.txt Removing a symbolic link If we use ls we can see that in the complex_path directory there is the test.txt file we have created at the beginning: complex_path]$ ls -alĭrwxrwxr-x 2 ec2-user ec2-user 22 Mar 18 00:14. To show the physical path we need to use the -P flag: complex_path]$ pwd -P Lrwxrwxrwx 1 ec2-user ec2-user 36 Mar 17 23:54 complex_path -> /opt/scripts/this/is/a/complex/path/Īnd now let’s cd into the symlinked directory and use pwd to check the working directory: scripts]$ cd complex_path]$ pwdĪs you can see the pwd command shows the logical path for the directory instead of the actual real path of the directory the symlink refers to… Here is what we get when we create the complex_path symlink: scripts]$ scripts]$ ls -al complex_path Where source_directory is the existing directory and target_directory is the name of the link we are creating. Ln -s /opt/scripts/this/is/a/complex/path/ complex_path Under /opt/scripts/ we create a symlink called complex_path to the directory in which the file is located. Now, we want to access this file without having to remember this complex path. echo "This is our test file" > /opt/scripts/this/is/a/complex/path/test.txtĪs you can see we have used the echo command and redirection to create a file that has a single line with the text “This is our test file”. Then we create a file called test.txt under the directory /opt/scripts/this/is/a/complex/path/. Mkdir: cannot create directory ‘/opt/scripts/this2/is/a/complex/path/’: No such file or directory Here is what happens without the -p flag (we replace the directory this with this2): mkdir /opt/scripts/this2/is/a/complex/path/ This flag is used to create any directories in this path if they don’t exist.
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You can see that we are passing the -p flag to the mkdir command. Let’s see an example of how we can create a symbolic link to a Linux directory.Ĭreate a new directory under /opt/scripts/: mkdir -p /opt/scripts/this/is/a/complex/path/ Makes sense? Symbolic Link to a Directory in Linux
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Lrwxrwxrwx 1 ec2-user ec2-user 17 Sep 1 14:50 last_report -> report_August2020 Our script has to repoint the symlink from report_July2020 to report_August2020 using the unlink and ln commands: reports]$ unlink reports]$ ln -s report_August2020 reports]$ ls -ltr What happens when the report for the next month is generated? In this way I can see the content of the most recent report simply using the command: cat last_report With the ls command we can see the symlink created: lrwxrwxrwx 1 ec2-user ec2-user 15 Aug 1 14:57 last_report -> report_July2020 In this specific case the script that generates the report for July would also execute the following command: ln -s report_July2020 last_report
How to check if i have symbolic math toolbox update#
I can update the script that generates the monthly report to also create a symlink called last_report that points to the most recent report generated. Let’s say I want to have an automated way to access the latest report without knowing its name (that changes from month to month). One reason is to refer to files on our Linux system in a more generic way.įor example, I have created the reports directory in which every month an automated script (not part of this tutorial) creates a report of the monthly expenses for my business.īelow you can see the content of the reports directory: reports]$ ls -ltr Why would you create a symlink to a file in Linux? Let’s start! Symbolic Link to a File in Linux In this article we will play with the ln command to get familiar with the creation of symbolic links on Linux. The ln command allows to create symbolic links on a Linux system. You can use it to simplify the way you access the file or directory if their path is long or difficult to remember. You might have heard the word symlink instead…they are the same thing.Ī symbolic link in Linux (or Unix-like operating systems) is a shortcut to a file or directory. Have you ever heard about the concept of symbolic link in Linux?