# Bash 的 echo 命令

echo [OPTION]... [STRING]...

# 显示文本
echo https://xplanc.org/

# 加粗 前景黄色 背景红色
echo -e "\e[1;33;41mhttps://xplanc.org/\e[0m"

# 使用 256 色模式，前景色是 201 背景色是 51
echo -e "\e[38;5;201;48;5;51mhttps://xplanc.org/\e[0m"

# 使用 24 位 RGB 模式，前景色是 255,255,0 背景色是 0,0,255
echo -e "\e[38;2;255;255;0;48;2;0;0;255mhttps://xplanc.org/\e[0m"

ECHO(1)                          User Commands                         ECHO(1)

NAME
       echo - display a line of text

SYNOPSIS
       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION
       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
              output version information and exit

       If -e is in effect, the following sequences are recognized:

       \\     backslash

       \a     alert (BEL)

       \b     backspace

       \c     produce no further output

       \e     escape

       \f     form feed

       \n     new line

       \r     carriage return

       \t     horizontal tab

       \v     vertical tab

       \0NNN  byte with octal value NNN (1 to 3 digits)

       \xHH   byte with hexadecimal value HH (1 to 2 digits)

       NOTE: your shell may have its own version of echo, which usually super‐
       sedes  the  version described here.  Please refer to your shell's docu‐
       mentation for details about the options it supports.

       NOTE: printf(1) is a preferred alternative, which does not have  issues
       outputting option-like strings.

AUTHOR
       Written by Brian Fox and Chet Ramey.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright  ©  2023  Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       printf(1)

       Full documentation <https://www.gnu.org/software/coreutils/echo>
       or available locally via: info '(coreutils) echo invocation'

GNU coreutils 9.4                 April 2024                           ECHO(1)