Update cheatsheets

tldr/linux/agetty

@@ -0,0 +1,35 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# agetty
+
+> Alternative `getty`: Open a `tty` port, prompt for a login name, and invoke the `/bin/login` command.
+> It is normally invoked by `init`.
+> Note: the baud rate is the speed of data transfer between a terminal and a device over a serial connection.
+> More information: <https://manned.org/agetty>.
+
+- Connect `stdin` to a port (relative to `/dev`) and optionally specify a baud rate (defaults to 9600):
+
+`agetty {{tty}} {{115200}}`
+
+- Assume `stdin` is already connected to a `tty` and set a [t]imeout for the login:
+
+`agetty {{-t|--timeout}} {{timeout_in_seconds}} -`
+
+- Assume the `tty` is [8]-bit, overriding the `TERM` environment variable set by `init`:
+
+`agetty -8 - {{term_var}}`
+
+- Skip the login ([n]o login) and invoke, as root, another [l]ogin program instead of `/bin/login`:
+
+`agetty {{n|--skip-login}} {{-l|--login-program}} {{login_program}} {{tty}}`
+
+- Do not display the pre-login ([i]ssue) file (`/etc/issue` by default) before writing the login prompt:
+
+`agetty {{-i|--noissue}} -`
+
+- Change the [r]oot directory and write a specific fake [H]ost into the `utmp` file:
+
+`agetty {{-r|--chroot}} {{/path/to/root_directory}} {{-H|--host}} {{fake_host}} -`

tldr/linux/zipsplit

@@ -5,17 +5,21 @@ source: https://github.com/tldr-pages/tldr.git
 ---
 # zipsplit
 
-> Read a zipfile and split it into smaller zipfiles.
+> Split a Zip archive into smaller Zip archives.
 > More information: <https://manned.org/zipsplit>.
 
-- Split zipfile into pieces that are no larger than a particular size [n]:
+- Split Zip archive into parts that are no larger than 36000 bytes (36 MB):
+
+`zipsplit {{path/to/archive.zip}}`
+
+- Use a given [n]umber of bytes as the part limit:
 
 `zipsplit -n {{size}} {{path/to/archive.zip}}`
 
-- [p]ause between the creation of each split zipfile:
+- [p]ause between the creation of each part:
 
 `zipsplit -p -n {{size}} {{path/to/archive.zip}}`
 
-- Output the split zipfiles into the `archive` directory:
+- Output the smaller Zip archives into a given directory:
 
-`zipsplit -b {{archive}} -n {{size}} {{path/to/archive.zip}}`
+`zipsplit -b {{path/to/output_directory}} -n {{size}} {{path/to/archive.zip}}`

tldr/pamfix

@@ -0,0 +1,22 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamfix
+
+> Fix errors in PAM, PBM, PGM and PPM files.
+> See also: `pamfile`, `pamvalidate`.
+> More information: <https://netpbm.sourceforge.net/doc/pamfix.html>.
+
+- Fix a Netpbm file that is missing its last part:
+
+`pamfix -truncate {{path/to/corrupted.ext} > {{path/to/output.ext}}`
+
+- Fix a Netpbm file where pixel values exceed the image's `maxval` by lowering the offending pixels' values:
+
+`pamfix -clip {{path/to/corrupted.ext}} > {{path/to/output.ext}}`
+
+- Fix a Netpbm file where pixel values exceed the image's maxval by increasing it:
+
+`pamfix -changemaxval {{path/to/corrupted.pam|pbm|pgm|ppm}} > {{path/to/output.pam|pbm|pgm|ppm}}`

tldr/pamfixtrunc

@@ -0,0 +1,13 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamfixtrunc
+
+> This command is superseded by `pamfix -truncate`.
+> More information: <https://netpbm.sourceforge.net/doc/pamfixtrunc.html>.
+
+- View documentation for the current command:
+
+`tldr pamfix`

tldr/pamvalidate

@@ -0,0 +1,14 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamvalidate
+
+> Validate PAM, PGM, PBM and PPM files.
+> See also: `pamfile`, `pamfix`.
+> More information: <https://netpbm.sourceforge.net/doc/pamvalidate.html>.
+
+- Copy a Netpbm file from `stdin` to `stdout` if and only if it valid; fail otherwise:
+
+`{{command}} | pamvalidate > {{path/to/output.ext}}`

tldr/zipcloak

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zipcloak
+
+> Encrypt the contents within a Zip archive.
+> More information: <https://manned.org/zipcloak>.
+
+- Encrypt the contents of a Zip archive:
+
+`zipcloak {{path/to/archive.zip}}`
+
+- [d]ecrypt the contents of a Zip archive:
+
+`zipcloak -d {{path/to/archive.zip}}`
+
+- [O]utput the encrypted contents into a new Zip archive:
+
+`zipcloak {{path/to/archive.zip}} -O {{path/to/encrypted.zip}}`