linux echo 输出字符与变量 查看echo的帮助内容

ECS信息

规格：2vCPUs | 4GiB | kc1.large.2

镜像：openEuler 20.03 64bit with ARM | 公共镜像

linux echo 输出字符与变量 查看echo的帮助内容

# echo $SHELL /bin/bash

# echo hello world hello world

正确示范

# /bin/echo --help Usage: /bin/echo [SHORT-OPTION]... [STRING]... or: /bin/echo LONG-OPTION 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

# /bin/echo --help Usage: /bin/echo [SHORT-OPTION]... [STRING]... or: /bin/echo LONG-OPTION 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 supersedes the version described here. Please refer to your shell's documentation for details about the options it supports. GNU coreutils online help: Full documentation or available locally via: info '(coreutils) echo invocation'

NNN 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 supersedes the version described here. Please refer to your shell's documentation for details about the options it supports. GNU coreutils online help: Full documentation or available locally via: info '(coreutils) echo invocation'

错误示范

# echo -? -?

# echo --help --help

# echo

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