preparing for ebook publishing 📗

.vscode/settings.json

@@ -5,38 +5,51 @@
     "RNFR",
     "RNTO",
     "Remisa",
+    "Shellman",
     "Yousefvand",
     "abcdefg",
+    "backmatter",
     "busybox",
     "chmod",
     "codename",
     "czvf",
     "distro",
+    "dockerd",
     "elif",
     "epub",
     "esac",
+    "frontmatter",
     "glibc",
     "gmail",
     "icanhazip",
     "ifconfig",
     "ipecho",
     "ipify",
     "ipinfo",
+    "ksoftirqd",
+    "kthreadd",
+    "kworker",
     "lscpu",
+    "mainmatter",
     "maxdepth",
     "meminfo",
     "mkdir",
     "mobi",
     "mtime",
     "multiline",
     "mylib",
+    "pagebreak",
+    "pgrep",
+    "renice",
+    "sched",
     "setaf",
     "shellman",
     "shellmen",
     "sitm",
     "sonatype",
     "subarray",
     "systemctl",
+    "systemd",
     "tput",
     "uname",
     "vmlinuz",

manuscript/Book.txt

@@ -20,6 +20,7 @@ ns/ftp.md
 ns/file.md
 ns/color.md
 ns/format.md
+ns/process.md
 ns/system.md
 ns/git.md
 ns/misc.md

manuscript/ns/command.md

@@ -51,7 +51,7 @@ fi
 
 ### nice
 
-Run a command with modified scheduling priority. Niceness  values range  from  `-20` (most favorable to the process) to `19` (least favorable to the process) and default value is `10`.
+Run a command with modified scheduling priority. Niceness  values range  from  `-20` (highest priority) to `19` (lowest priority) and default value is `0`.
 
 ```bash
 #!/usr/bin/env bash
@@ -61,6 +61,18 @@ sudo nice -n 19 cp ~/file ~/tmp
 
 In above example we are copying a file from *home* to *tmp* folder, and schedule minimum CPU time to `cp`.
 
+### renice
+
+Change a running process priority. Niceness  values range  from  `-20` (highest priority) to `19` (lowest priority) and default value is `0`.
+
+```bash
+#!/usr/bin/env bash
+
+sudo renice -n -5 -p `pgrep dockerd`
+```
+
+In above example we are changing priority of `dockerd` process (docker daemon on a system where docker is installed) to higher than normal.
+
 ### if cmd exists {#cmd-exist}
 
 Check if a desired command exists (program is installed).

manuscript/ns/process.md

@@ -0,0 +1,43 @@
+## process
+
+Contains `Process` related information and operations.
+
+### list
+
+List all system processes.
+
+```bash
+#!/usr/bin/env bash
+
+ps -A
+#   PID TTY       TIME       CMD
+#    1   ?        00:00:03 systemd
+#    2   ?        00:00:00 kthreadd
+#    3   ?        00:00:01 ksoftirqd/0
+#    5   ?        00:00:00 kworker/0:0H
+#    7   ?        00:01:46 rcu_sched
+# ...
+```
+
+### ID
+
+Get process ID by its name. Many Linux commands need *process id* (PID).
+
+```bash
+#!/usr/bin/env bash
+
+firefoxPID=`pgrep firefox`
+echo $firefoxPID
+```
+
+### Kill
+
+Kill a process by its name. `kill` command needs a *PID* (process ID) which we can find by `pgrep` command via [command substitution](#command-substitution).
+
+```bash
+#!/usr/bin/env bash
+
+sudo kill -9 `pgrep firefox`
+```
+
+In above example we find *firefox* `PID` and pass it to `kill` command. Here `-9` is a switch of `kill` command (kill signal). You can see a list of all signals by typing `kill -l` in terminal.