output_redirection : remove NOTE tag.

help/linux/bash/basic/color.md

@@ -0,0 +1,30 @@
+# Bash colors.
+
+## How to use.
+Most of the time you want to use it with `echo`. To make `echo` respect colors, you need to use `-e` flag like that:
+```bash
+export color_default="\033[0m"
+export color_red="\033[0;31m"
+echo -e "${color_red}hello world!${color_default}" # will print "hello world!" in red.
+```
+
+## List of colors.
+Please note that colors depend on Terminal Emulator and may vary based on its settings.
+
+|Color|Code|
+|---|---|
+|default|`\033[0m`|
+|blue|`\033[0;34m`|
+|blue (bold)|`\033[1;34m`|
+|cyan|`\033[0;36m`|
+|cyan (bold)|`\033[1;36m`|
+|green|`\033[0;32m`|
+|green (bold)|`\033[1;32m`|
+|purple|`\033[0;35m`|
+|purple (bold)|`\033[1;35m`|
+|red|`\033[0;31m`|
+|red (bold)|`\033[1;31m`|
+|white|`\033[0;37m`|
+|white (bold)|`\033[1;37m`|
+|yellow|`\033[0;33m`|
+|yellow (bold)|`\033[1;33m`|

help/linux/bash/basic/output_redirection.md

@@ -8,7 +8,7 @@ echo "hello" | base64
 ## file.
 ```bash
 echo "hello" > file.txt # write "hello" to file.txt.
-less < file.txt         # read from file.txt and send to less. NOTE: program must support reading from stdin.
+less < file.txt         # read from file.txt and send to less. program must support reading from stdin.
 ```
 
 ## output as argument.

help/linux/bash/color/todo.md

@@ -1 +0,0 @@
-TODO: add info about colors.