Update Linux Introduction

Linux-Introduction.md

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+## Documentation pages: 
+Merlin usage: https://lsm-hpce.gitpages.psi.ch/merlin6/introduction.html
+
+
+## Some useful commands in the Terminal: 
+
+- listing the content of the current working directory: `$ ls -lrt `
+- changing directory: `$ cd /path/to/dir`
+- creating a directory: `mkdir /path/to/dir`
+- removing a directory: `rm -r /path/to/dir`
+- copying a directory or file: `cp -r (-r only for folders) /path/to/file /destination/of/file`
+- editing files:  `emacs <name-of-file>` or `nedit <name-of-file> `or `vim (advanced) ` 
+- showing file contents in the terminal: `more <name-of-file>` 
+- showing the size of folders/files in one specific folder: `du –max-depth 1 -h `
+
+
+## ~/.bashrc  file 
+- The ~/.bashrc file is similar to a "config" file that is executed every time that you open a new terminal. 
+- Inside the ~/.bashrc file, paths, variables and user-specific settings can be edited (use any editor), after changing, the terminal needs to be closed and reopened in order to make changes available. 
+- Examples that change the bashrc file: conda installations, cryosparc etc.. 
+
+
+## Personal user storage on Merlin (Ra) 
+
+Merlin storage documentation: https://lsm-hpce.gitpages.psi.ch/merlin6/storage.html
+
+Ra storage documentation: https://hpc-sysadmins.gitpages.psi.ch/ra/storage.html
+
+Most important info: 
+
+- `/data/user/$username:` 1TB , no backup 
+- `/psi/home/$username:` 10GB , Backup 
+