Update cheatsheets

tldr/entr

@@ -6,7 +6,7 @@ source: https://github.com/tldr-pages/tldr.git
 # entr
 
 > Run arbitrary commands when files change.
-> More information: <https://manned.org/entr>.
+> More information: <http://eradman.com/entrproject/>.
 
 - Rebuild with `make` if any file in any subdirectory changes:
 
@@ -23,3 +23,15 @@ source: https://github.com/tldr-pages/tldr.git
 - Run a command with the changed file (`/_`) as an argument:
 
 `{{ls *.sql}} | entr {{psql -f}} /_`
+
+- [c]lear the screen and run a query after the SQL script is updated:
+
+`{{echo my.sql}} | entr -cp {{psql -f}} /_`
+
+- Rebuild the project if source files change, limiting output to the first few lines:
+
+`{{find src/}} | entr -s {{'make | sed 10q'}}`
+
+- Launch and auto-[r]eload a Node.js server:
+
+`{{ls *.js}} | entr -r {{node app.js}}`

tldr/linux/check-dfsg-status

@@ -0,0 +1,18 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# check-dfsg-status
+
+> Report non-free packages installed on Debian-based OSes.
+> This command was formerly known as `vrms`.
+> More information: <https://debian.pages.debian.net/check-dfsg-status/>.
+
+- List non-free and contrib packages (and their description):
+
+`check-dfsg-status`
+
+- Only output the package names:
+
+`check-dfsg-status --sparse`

tldr/linux/opkg

@@ -20,10 +20,6 @@ source: https://github.com/tldr-pages/tldr.git
 
 `opkg update`
 
-- Upgrade all the installed packages:
-
-`opkg upgrade`
-
 - Upgrade one or more specific package(s):
 
 `opkg upgrade {{package(s)}}`

tldr/linux/pwn

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pwn
+
+> Exploit Development Library designed for rapid prototyping.
+> More information: <https://docs.pwntools.com/en/stable/commandline.html>.
+
+- Convert  the given assembly code to `bytes`:
+
+`pwn asm "{{xor edi, edi}}"`
+
+- Create a cyclic pattern of the specific number of characters:
+
+`pwn cyclic {{number}}`
+
+- Encode the given data into the hexadecimal system:
+
+`pwn hex {{deafbeef}}`
+
+- Decode the given data from hexadecimal:
+
+`pwn unhex {{6c4f7645}}`
+
+- Print a x64 Linux shellcode for running a shell:
+
+`pwn shellcraft {{amd64.linux.sh}}`
+
+- Check the binary security settings for the given ELF file:
+
+`pwn checksec {{path/to/file}}`
+
+- Check for Pwntools updates:
+
+`pwn update`
+
+- Display version:
+
+`pwn version`