Update cheatsheets

tldr/[

@@ -7,6 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Check file types and compare values.
 > Returns a status of 0 if the condition evaluates to true, 1 if it evaluates to false.
+> See also: `test`.
 > More information: <https://gnu.org/software/bash/manual/bash.html#index-test>.
 
 - Test if a given variable is equal/not equal to the specified string:

tldr/chgrp

@@ -6,6 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # chgrp
 
 > Change group ownership of files and directories.
+> See also: `chown`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/chgrp-invocation.html>.
 
 - Change the owner group of a file/directory:

tldr/chown

@@ -6,6 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # chown
 
 > Change user and group ownership of files and directories.
+> See also: `chgrp`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/chown-invocation.html>.
 
 - Change the owner user of a file/directory:
@@ -20,6 +21,10 @@ source: https://github.com/tldr-pages/tldr.git
 
 `sudo chown {{user}}: {{path/to/file_or_directory}}`
 
+- Change the group of a file to a group that the current user belongs to:
+
+`chown :{{group}} {{path/to/file_or_directory}}`
+
 - Recursively change the owner of a directory and its contents:
 
 `sudo chown {{[-R|--recursive]}} {{user}} {{path/to/directory}}`

tldr/chroot

@@ -8,10 +8,14 @@ source: https://github.com/tldr-pages/tldr.git
 > Run command or interactive shell with special root directory.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/chroot-invocation.html>.
 
+- Run `$SHELL` in the new root directory:
+
+`sudo chroot {{path/to/new_root}}`
+
 - Run command as new root directory:
 
 `sudo chroot {{path/to/new_root}} {{command}}`
 
 - Use a specific user and group:
 
-`sudo chroot --userspec {{username_or_id:group_name_or_id}}`
+`sudo chroot --userspec {{username_or_id}}:{{group_name_or_id}} {{path/to/new_root}}`

tldr/dirname

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # dirname
 
-> Calculates the parent directory of a file or directory path.
+> Remove trailing filename portion from a path.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/dirname-invocation.html>.
 
 - Calculate the parent directory of a given path:

tldr/install

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # install
 
 > Copy files and set attributes.
-> Copy files (often executable) to a system location like `/usr/local/bin`, give them the appropriate permissions/ownership.
+> Typically used by Makefiles.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/install-invocation.html>.
 
 - Copy files to the destination:

tldr/linux/mknod

@@ -22,4 +22,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Create a device file with default SELinux security context:
 
-`sudo mknod {{[-Z |--context=]}}{{path/to/device_file}} {{type}} {{major_device_number}} {{minor_device_number}}`
+`sudo mknod {{[-Z|--context]}} {{path/to/device_file}} {{type}} {{major_device_number}} {{minor_device_number}}`

tldr/linux/nl

@@ -36,6 +36,6 @@ source: https://github.com/tldr-pages/tldr.git
 
 `nl {{[-w|--number-width]}} {{col_width}} {{path/to/file}}`
 
-- Use a specific string to separate the line numbers from the lines (TAB by default):
+- Use a specific string to separate the line numbers from the lines (`TAB` by default):
 
 `nl {{[-s|--number-separator]}} {{separator}} {{path/to/file}}`

tldr/linux/pivot_root

@@ -0,0 +1,18 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pivot_root
+
+> Change the root filesystem to a new directory and move the current root to a subdirectory of the new root.
+> Commonly used during system initialization (e.g., in `initramfs`) to switch from a temporary root to the real root filesystem.
+> More information: <https://manned.org/pivot_root.8>.
+
+- Make `/new_root` the new root (`/`) and move current root to a subdirectory of it:
+
+`sudo pivot_root {{path/to/new_root}} {{path/to/new_root/old_root}}`
+
+- Display help:
+
+`pivot_root {{[-h|--help]}}`

tldr/mkfifo

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # mkfifo
 
-> Make FIFOs (named pipes).
+> Make named pipes, also known as First In First Out (FIFO).
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/mkfifo-invocation.html>.
 
 - Create a named pipe at a given path:

tldr/nh

@@ -16,10 +16,14 @@ source: https://github.com/tldr-pages/tldr.git
 
 `nh clean all {{[-a|--ask]}}`
 
-- Build a specified Nixos flake configuration and open it in a virtual machine:
+- Build a specified Nixos flake configuration and create a symlink of the result from the Nix store:
 
 `nh os build-vm {{path/to/flake}} {{[-H|--hostname]}} {{host}}`
 
+- Build and test a specified Nixos flake configuration:
+
+`nh os test {{path/to/flake}} {{[-H|--hostname]}} {{nixos}}`
+
 - Build and switch to a specified Home manager flake configuration:
 
 `nh home switch {{path/to/flake}} {{[-c|--configuration]}} {{home}}`

tldr/nix-build

@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > `nix-build` can refer to multiple commands with the same name.
 
-- View documentation for the traditional builder:
+- View documentation for the traditional builder before version 2.4 of Nix:
 
 `tldr nix-build.2`
 

tldr/nix-collect-garbage

@@ -9,7 +9,7 @@ source: https://github.com/tldr-pages/tldr.git
 > Generations can be listed using `nix-env --list-generations`.
 > More information: <https://nixos.org/manual/nix/stable/command-ref/nix-collect-garbage.html>.
 
-- Delete all store paths unused by current generations of each profile:
+- Delete all user related store paths unused by current generations of each profile:
 
 `nix-collect-garbage {{[-d|--delete-old]}}`
 
@@ -20,3 +20,7 @@ source: https://github.com/tldr-pages/tldr.git
 - Delete all store paths older than 30 days:
 
 `nix-collect-garbage --delete-older-than 30d`
+
+- Delete all store paths unused by the current generation of each profile system-wide:
+
+`sudo nix-collect-garbage {{[-d|--delete-old]}}`

tldr/nix-shell

@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > `nix-shell` can refer to multiple commands with the same name.
 
-- View documentation for the traditional shell:
+- View documentation for the traditional shell before version 2.4 of Nix:
 
 `tldr nix-shell.2`
 

tldr/nix-store

@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > `nix-store` can refer to multiple commands with the same name.
 
-- View documentation for the traditional store:
+- View documentation for the traditional store before version 2.4 of Nix:
 
 `tldr nix-store.2`
 

tldr/nl

@@ -36,6 +36,6 @@ source: https://github.com/tldr-pages/tldr.git
 
 `nl -w {{col_width}} {{path/to/file}}`
 
-- Use a specific string to [s]eparate the line numbers from the lines (TAB by default):
+- Use a specific string to [s]eparate the line numbers from the lines (`TAB` by default):
 
 `nl -s {{separator}} {{path/to/file}}`

tldr/paste

@@ -8,15 +8,15 @@ source: https://github.com/tldr-pages/tldr.git
 > Merge lines of files.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/paste-invocation.html>.
 
-- Join all the lines into a single line, using TAB as delimiter:
+- Join all the lines into a single line, using `TAB` as delimiter:
 
 `paste {{[-s|--serial]}} {{path/to/file}}`
 
 - Join all the lines into a single line, using the specified delimiter:
 
-`paste {{[-sd|--serial --delimiters]}} {{delimiter}} {{path/to/file}}`
+`paste {{[-s|--serial]}} {{[-d|--delimiters]}} {{delimiter}} {{path/to/file}}`
 
-- Merge two files side by side, each in its column, using TAB as delimiter:
+- Merge two files side by side, each in its column, using `TAB` as delimiter:
 
 `paste {{path/to/file1}} {{path/to/file2}}`
 

tldr/printenv

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # printenv
 
-> Print values of all or environment variables.
+> Print values of environment variables.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/printenv-invocation.html>.
 
 - Display key-value pairs of all environment variables:

tldr/printf

@@ -36,4 +36,5 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Print a hexadecimal, octal and scientific number:
 
-`printf "{{hex=%x octal=%o scientific=%e}}" 0x{{FF}} 0{{377}} {{100000}}`
+`printf "{{hex=%x octal=%o scientific=%e
+}}" 0x{{FF}} 0{{377}} {{100000}}`

tldr/seq

@@ -8,18 +8,26 @@ source: https://github.com/tldr-pages/tldr.git
 > Output a sequence of numbers to `stdout`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/seq-invocation.html>.
 
-- Sequence from 1 to 10:
+- Print a sequence from 1 to 10:
 
 `seq 10`
 
-- Every 3rd number from 5 to 20:
+- Print a sequence from 10 to 20:
+
+`seq 10 20`
+
+- Print every 3rd number from 5 to 20:
 
 `seq 5 3 20`
 
 - Separate the output with a space instead of a newline:
 
-`seq {{[-s|--separator]}} " " 5 3 20`
+`seq {{[-s|--separator]}} " " {{5 3 20}}`
 
 - Format output width to a minimum of 4 digits padding with zeros as necessary:
 
-`seq {{[-f|--format]}} "%04g" 5 3 20`
+`seq {{[-f|--format]}} "%04g" {{5 3 20}}`
+
+- Print all numbers with the same width:
+
+`seq {{[-w|--equal-width]}} {{5 3 20}}`

tldr/shred

@@ -30,4 +30,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Overwrite a file 100 times, add a final overwrite with zeros, remove the file after overwriting it and show verbose progress on the screen:
 
-`shred {{[-vzun|--verbose --zero --remove --iterations]}} 100 {{path/to/file}}`
+`shred {{[-vzu|--verbose --zero --remove]}} {{[-n|--iterations]}} 100 {{path/to/file}}`

tldr/stty

@@ -5,7 +5,7 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # stty
 
-> Set options for a terminal device interface.
+> Set or get options for a terminal device interface.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/stty-invocation.html>.
 
 - Display current terminal size:

tldr/test

@@ -7,6 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Check file types and compare values.
 > Returns 0 if the condition evaluates to true, 1 if it evaluates to false.
+> See also: `[`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/test-invocation.html>.
 
 - Test if a given variable is equal to a given string:

tldr/touch

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # touch
 
 > Create files and set access/modification times.
-> More information: <https://manned.org/touch>.
+> More information: <https://www.gnu.org/software/coreutils/manual/html_node/touch-invocation.html>.
 
 - Create specific files:
 

tldr/truncate

@@ -26,4 +26,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Empty the file's content, but do not create the file if it does not exist:
 
-`truncate {{[-cs|--no-create --size]}} 0 {{path/to/file}}`
+`truncate {{[-s|--size]}} 0 {{[-c|--no-create]}} {{path/to/file}}`

tldr/users

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # users
 
 > Display a list of logged in users.
-> See also: `useradd`, `userdel`, `usermod`.
+> See also: `who`, `w`, `useradd`, `userdel`, `usermod`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/users-invocation.html>.
 
 - Print logged in usernames:

tldr/vdir

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # vdir
 
 > Verbosely list directory contents.
-> Drop-in replacement for `ls -l -b`.
+> Drop-in replacement for `ls -l --escape`.
 > More information: <https://manned.org/vdir>.
 
 - List files and directories in the current directory, one per line, with details:

tldr/w

@@ -6,6 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # w
 
 > Display who is logged in and their processes.
+> See also: `who`, `users`.
 > More information: <https://manned.org/w>.
 
 - Display information about all users who are currently logged in:

tldr/who

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # who
 
 > Display who is logged in and related data (processes, boot time).
-> See also: `whoami`.
+> See also: `users`, `w`, `whoami`.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/who-invocation.html>.
 
 - Display the username, line, and time of all currently logged-in sessions: