vault backup: 2025-01-13 13:16:06

23 files changed, 63 insertions, 23 deletions

diff --git a/3 resources/linux/APT.md b/3 resources/linux/APT.md
new file mode 100644
index 0000000..9231d40
--- /dev/null
+++ b/3 resources/linux/APT.md
@@ -0,0 +1,5 @@
+#linux #packages #how-to
+
+---
+reinstall packages:
+`apt reinstall <pkg>`
\ No newline at end of file
diff --git a/3 resources/linux/Definitions.md b/3 resources/linux/Definitions.md
new file mode 100644
index 0000000..c0ca4dd
--- /dev/null
+++ b/3 resources/linux/Definitions.md
@@ -0,0 +1,6 @@
+#linux #definitions 
+
+---
+NBP = Network Bootstrap Program
+PXE = Preboot Execution  Environment
+NIC = Network Interface Card
\ No newline at end of file
diff --git a/3 resources/linux/device-drivers.md b/3 resources/linux/Device drivers.md
index e4fe9d2..95f1a75 100644
--- a/3 resources/linux/device-drivers.md
+++ b/3 resources/linux/Device drivers.md
@@ -1,3 +1,6 @@
+#linux #devices 
+
+---
 major, minor numbers
 major = driver (used by kernel when opening device to dispatch to correct driver)
 minor = used by driver to differentiate device(s)
diff --git a/3 resources/linux/device-mapper.md b/3 resources/linux/Device mapper.md
index f862496..059a0d1 100644
--- a/3 resources/linux/device-mapper.md
+++ b/3 resources/linux/Device mapper.md
@@ -1,7 +1,10 @@
+#linux #device-mapper
+
+---
 Device mapper is a kernel driver to map physical block devices to virtual ones; this means that for example we can have many physical devices be represented by a single virtual one (linear mapping).
 
 How does it work?
-[[TODO]]
+[[1 projects/Inwerken Mohammed/TODO]]
 What is its function in relation to multipath?
 
 Logical devices using device-mapper can be managed using `man 8 dmsetup`
diff --git a/3 resources/linux/lsof.md b/3 resources/linux/LSOF.md
index e95b968..5a3aa95 100644
--- a/3 resources/linux/lsof.md
+++ b/3 resources/linux/LSOF.md
@@ -1,3 +1,7 @@
+#linux #how-to 
+
+---
+
 ```
 lsof -p 1111 # show open files for this PID
 lsof /path/to/file # show which process has this open
diff --git a/3 resources/linux/Users.md b/3 resources/linux/Users.md
new file mode 100644
index 0000000..885a7cc
--- /dev/null
+++ b/3 resources/linux/Users.md
@@ -0,0 +1,22 @@
+#linux #user-management 
+
+Change uid/gid of user
+`usermod -u newnumber user`
+`groupmod -g newnumber user`
+
+File permissions in homedir will be automatically updated; file perms outside home dir will not be automatically updated.
+
+Finding files of a specific user, and printing their uid/gid;
+`sudo find / -user 4109 -printf '%p %u(%U) %g(%G)\n'`
+
+To change only the group: `chgrp`.
+
+Or using find to chmod/chgrp:
+`sudo find / -user 4109 -group 4109 -exec chmod 998:998 {} \;`
+`sudo find / -group 4109 -exec chgrp 998 {} \;`
+
+Dirty way to find "system users" (uid < 999) - note that this is not fool-proof, it also lists groups
+`getent passwd | grep -oP '\b[0-9]{3}\b' | uniq | sort`
+
+---
+https://www.cyberciti.biz/faq/linux-change-user-group-uid-gid-for-all-owned-files/
diff --git a/3 resources/linux/Watch.md b/3 resources/linux/Watch.md
index dafeb80..0c167b7 100644
--- a/3 resources/linux/Watch.md
+++ b/3 resources/linux/Watch.md
@@ -1 +1,4 @@
-`watch (1)` periodically executes the executable on argv. It can be used to reload the output of a command, like `sudo watch ovs-dpctl dump-flows` .
\ No newline at end of file
+#linux #how-to 
+
+---
+`watch (1)` periodically executes the executable on argv. It can be used to reload the output of a command, like `sudo watch ovs-dpctl dump-flows` .
diff --git a/3 resources/linux/apt.md b/3 resources/linux/apt.md
deleted file mode 100644
index 36a098c..0000000
--- a/3 resources/linux/apt.md
+++ /dev/null
@@ -1,2 +0,0 @@
-reinstall packages:
-`apt reinstall <pkg>`
\ No newline at end of file
diff --git a/3 resources/linux/bootloader.md b/3 resources/linux/bootloader.md
deleted file mode 100644
index e9c2fff..0000000
--- a/3 resources/linux/bootloader.md
+++ /dev/null
@@ -1 +0,0 @@
-[[TODO]]
\ No newline at end of file
diff --git a/3 resources/linux/filesystems/tmpfs.md b/3 resources/linux/filesystems/Tmpfs.md
index 624c835..b8fe839 100644
--- a/3 resources/linux/filesystems/tmpfs.md
+++ b/3 resources/linux/filesystems/Tmpfs.md
@@ -1,3 +1,6 @@
+#linux #filesystem
+
+---
 Is a [[virtual filesystem]] that is stored in memory; it uses both RAM and swap space.
 > Kernel option: CONFIG_TMPFS
 
diff --git a/3 resources/linux/filesystems/virtual filesystem.md b/3 resources/linux/filesystems/virtual filesystem.md
deleted file mode 100644
index e69de29..0000000
--- a/3 resources/linux/filesystems/virtual filesystem.md
+++ /dev/null
diff --git a/3 resources/linux/glibc.md b/3 resources/linux/glibc.md
deleted file mode 100644
index 18d18e1..0000000
--- a/3 resources/linux/glibc.md
+++ /dev/null
@@ -1 +0,0 @@
-The GNU C standard library.
\ No newline at end of file
diff --git a/3 resources/linux/man pages.md b/3 resources/linux/man pages.md
deleted file mode 100644
index 576d4b8..0000000
--- a/3 resources/linux/man pages.md
+++ /dev/null
@@ -1,2 +0,0 @@
-I need to more consistently read man pages. Example is `man task` to see how taskwarrior works, after reading it today I found that it is actually quite easy.
-They often contain good information on how to use a certain tool.
\ No newline at end of file
diff --git a/3 resources/linux/networking/DHCP.md b/3 resources/linux/networking/DHCP.md
new file mode 100644
index 0000000..e7e8e38
--- /dev/null
+++ b/3 resources/linux/networking/DHCP.md
@@ -0,0 +1,5 @@
+#networking #linux 
+
+---
+Dynamic Host Configuration Protocol
+Allows hosts dynamically receive an IP address.
\ No newline at end of file
diff --git a/3 resources/linux/networking/ip-masquerade-nat.md b/3 resources/linux/networking/IP masquerade.md
index 8b722f4..2ccc8e6 100644
--- a/3 resources/linux/networking/ip-masquerade-nat.md
+++ b/3 resources/linux/networking/IP masquerade.md
@@ -1,3 +1,6 @@
+#linux #networking 
+
+---
 A function in the kernel that allows guests with internal/private IPs to access the internet by using the hosts' public IP similar to 1 to many NAT.
 
 Differences with Proxy, IP Masq, NAT:
diff --git a/3 resources/linux/networking/pxe-boot.md b/3 resources/linux/networking/PXE.md
index d532ac3..d5fe4d1 100644
--- a/3 resources/linux/networking/pxe-boot.md
+++ b/3 resources/linux/networking/PXE.md
@@ -1,4 +1,7 @@
-PXE = Preboot Execution  Environment. 
+#linux #pxe
+
+---
+The NBP is a bootloader that is obtained via the network typically via [[TFTP]]. It handles setting up an environment in which an OS can run or install. For example, it displays a boot menu and downloads the kernel images. It sets up hardware, for example the [[NIC]]s.
 
 PXE boot process:
 1. Modified [[DHCP]] request: request to include boot information (PXE boot request).
diff --git a/3 resources/linux/networking/dhcp.md b/3 resources/linux/networking/dhcp.md
deleted file mode 100644
index e426d6f..0000000
--- a/3 resources/linux/networking/dhcp.md
+++ /dev/null
@@ -1,4 +0,0 @@
-Dynamic Host Configuration Protocol
-Allows hosts dynamically receive an IP address.
-
-[[TODO]] learn exactly how it works
\ No newline at end of file
diff --git a/3 resources/linux/networking/nbp.md b/3 resources/linux/networking/nbp.md
deleted file mode 100644
index 19676ea..0000000
--- a/3 resources/linux/networking/nbp.md
+++ /dev/null
@@ -1,3 +0,0 @@
-Network Bootstrap Program
-
-Is a bootloader that is obtained via the network typically via [[TFTP]]. It handles setting up an environment in which an OS can run or install. For example, it displays a boot menu and downloads the kernel images. It sets up hardware, for example the [[NIC]]s.
\ No newline at end of file
diff --git a/3 resources/linux/networking/udp.md b/3 resources/linux/networking/udp.md
deleted file mode 100644
index e69de29..0000000
--- a/3 resources/linux/networking/udp.md
+++ /dev/null
diff --git a/3 resources/linux/nic.md b/3 resources/linux/nic.md
deleted file mode 100644
index 592ad1c..0000000
--- a/3 resources/linux/nic.md
+++ /dev/null
@@ -1 +0,0 @@
-Network Interface Card
\ No newline at end of file
diff --git a/3 resources/linux/shared anonymous memory mappings.md b/3 resources/linux/shared anonymous memory mappings.md
deleted file mode 100644
index 71d1cfc..0000000
--- a/3 resources/linux/shared anonymous memory mappings.md
+++ /dev/null
@@ -1,2 +0,0 @@
-[[TODO]]
-Linux API book: chapter 49
\ No newline at end of file
diff --git a/3 resources/linux/system v shared memory.md b/3 resources/linux/system v shared memory.md
deleted file mode 100644
index d1f690d..0000000
--- a/3 resources/linux/system v shared memory.md
+++ /dev/null
@@ -1,2 +0,0 @@
-[[TODO]]
-Linux API book chapter 48
\ No newline at end of file
diff --git a/3 resources/linux/tftp.md b/3 resources/linux/tftp.md
deleted file mode 100644
index 259fdec..0000000
--- a/3 resources/linux/tftp.md
+++ /dev/null
@@ -1,2 +0,0 @@
-Trivial File Transfer Protocol
-[[TODO]]
\ No newline at end of file