在bash中将换行符(LF)/换行符作为参数传递 [英] Passing line-feed(LF)/new-line character as an argument in bash
问题描述
如何在Bash CLI中传递包含LF字符的参数?类似于:myprog foo\nbar
How to pass an argument in Bash CLI that contains an LF character? Something like: myprog foo\nbar
我尝试过:
myprog `printf 'foo\nbar'`
myprog foo\nbar
我使用了这个bash程序来测试结果:
I used this bash program to test the results:
#myprog
echo $*
和node.js程序
#!/usr/bin/env node
console.log(process.argv[2])
它不起作用.
推荐答案
In bash use the ANSI C like strings, with the $'...' notation as below. This is especially useful when you want to pass special characters as arguments to some programs.
myProgram $'foo\nbar'
您可以看到形成的字符串的hexdump.不要混淆尾随的换行符，因为它是由bash
You can see the hexdump of the string formed. Don't confuse the trailing new line, since it is introduced by the here-string <<< construct in bash
$ hexdump -c <<< $'foo\nbar'
0000000 f o o \n b a r \n
0000008
还支持以下转义序列，在此更新列表，因为在重复的列表中不可用.
The following escape sequences are also supported, updating the list here, since it is not available in the duplicated one.
+-------------+----------------------------------------------------------------------------------------------------------------------------------+
| code | meaning |
| | |
+-------------+----------------------------------------------------------------------------------------------------------------------------------+
| \" | double-quote |
| \' | single-quote |
| \\ | backslash |
| \a | terminal alert character (bell) |
| \b | backspace |
| \e | escape (ASCII 033) |
| \E | escape (ASCII 033) \E is non-standard |
| \f | form feed |
| \n | newline |
| \r | carriage return |
| \t | horizontal tab |
| \v | vertical tab |
| \cx | a control-x character, for example, $'\cZ' to print the control sequence composed of Ctrl-Z (^Z) |
| \uXXXX | Interprets XXXX as a hexadecimal number and prints the corresponding character from the character set (4 digits) (Bash 4.2-alpha)|
| \UXXXXXXXX | Interprets XXXX as a hexadecimal number and prints the corresponding character from the character set (8 digits) (Bash 4.2-alpha)|
| \nnn | the eight-bit character whose value is the octal value nnn (one to three digits) |
| \xHH | the eight-bit character whose value is the hexadecimal value HH (one or two hex digits) |
+-------------+----------------------------------------------------------------------------------------------------------------------------------+
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