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--- marc:linux:rhcsa8_uittreksel [2021/11/30 20:57] – [Setting up a rhel server:] marcv
+++ marc:linux:rhcsa8_uittreksel [2021/12/02 21:49] (current) – [FHS; File Hierarchy Standard:] marcv
@@ Line 118: / Line 118: @@
 echo $PWD
 EOF</code>
+**The double "<<" is necessary! It does not matter if you use EOF, eof or any other string for closing**
 The print.sh file now contains:
@@ Line 261: / Line 263: @@
   * pwd
   * whoami
-  * ls
+  * ls (-l)
-  *
+  * ip addr show
+  * free (-m)
+  * df (-h)
+  * cat //file//
+  * findmnt
+===== Understanding the shell: =====
+  * tab completion
+  * history
+  * piping
+  * redirectorion
+  * environment variables: ''env | less'' will show you all environment variables
+  * aliases: ''alias upgrade='sudo apt update && sudo apt upgrade -y'''
+===== FHS; File Hierarchy Standard: =====
+  * Maintained by the Linux Foundation
+  * Starting point is root directory: /
+  * The directory location does not say anything about the location and/or device; various drives/partitions can be mounted into the directory structure.
+  * Some important directories:
+    * /boot: contains everything needed to boot the system:<code>-rw-r--r-- 1 root root   237884 okt 15 19:56 config-5.4.0-90-generic
+-rw-r--r-- 1 root root   237884 nov  5 17:02 config-5.4.0-91-generic
+drwx------ 2 root root     4096 jan  1  1970 efi
+drwxr-xr-x 4 root root     4096 dec  1 13:46 grub
+lrwxrwxrwx 1 root root       27 nov 30 06:55 initrd.img -> initrd.img-5.4.0-91-generic
+-rw-r--r-- 1 root root 52057331 nov 23 08:05 initrd.img-5.4.0-90-generic
+-rw-r--r-- 1 root root 52057689 nov 30 06:56 initrd.img-5.4.0-91-generic
+lrwxrwxrwx 1 root root       27 nov 30 06:55 initrd.img.old -> initrd.img-5.4.0-90-generic
+-rw-r--r-- 1 root root   182704 aug 18  2020 memtest86+.bin
+-rw-r--r-- 1 root root   184380 aug 18  2020 memtest86+.elf
+-rw-r--r-- 1 root root   184884 aug 18  2020 memtest86+_multiboot.bin
+-rw------- 1 root root  4755119 okt 15 19:56 System.map-5.4.0-90-generic
+-rw------- 1 root root  4755132 nov  5 17:02 System.map-5.4.0-91-generic
+lrwxrwxrwx 1 root root       24 nov 30 06:55 vmlinuz -> vmlinuz-5.4.0-91-generic (KERNEL)
+-rw------- 1 root root 11780352 okt 15 21:36 vmlinuz-5.4.0-90-generic (KERNEL)
+-rw------- 1 root root 11784448 nov  5 17:04 vmlinuz-5.4.0-91-generic (KERNEL)
+lrwxrwxrwx 1 root root       24 nov 30 06:55 vmlinuz.old -> vmlinuz-5.4.0-90-generic (KERNEL)</code>
+    * /dev: contains devices (harddrives, stdin, stdout, null, tty's, etc)
+    * /etc: contains configuration files
+    * /home: contains the homedirectories for normal users
+    * /usr: compares to "Program Files" on Windows; containing the binary files:
+      * /usr/bin containing binaries for everybody
+      * /usr/sbin containing system binaries that only root can use
+    * /var: for variable files (websites, printerspool, logfiles, etc)
+    * see ''man hier'' for more info!
+-02-6