Re: '\E' and '\e' are the same to bash -e but bash manual doesn't mention it

[Petteri Räty]

On 26.06.2011 17:01, qiao...@gentoo.org wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: i686
> OS: linux-gnu
> Compiler: i686-pc-linux-gnu-gcc
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
> -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
> -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib  
> -DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
>  -DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin' 
> -DSYS_BASHRC='/etc/bash/bashrc' -DSYS_BASH_LOGOUT='/etc/bash/bash_logout' 
> -DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -O2 -march=pentium4 -pipe
> uname output: Linux woodpecker 2.6.22-hardened-r8 #1 SMP Fri Oct 26 17:51:28 
> UTC 2007 i686 Intel(R) Xeon(TM) CPU 3.00GHz GenuineIntel GNU/Linux
> Machine Type: i686-pc-linux-gnu
> 
> Bash Version: 4.1
> Patch Level: 7
> Release Status: release
> 
> Description:
> $ [[ xx$(echo -e $'\E')xx == xx$(echo -e '\e')xx ]] && echo "true"
> $ true
> 
> Fix:
> Mention it in bash manual.
> 
> 

GNU bash, version 4.2.10(2)-release (i686-pc-linux-gnu)

Here I can see it in man bash but help echo is missing it:


    `echo' interprets the following backslash-escaped characters:
      \a        alert (bell)
      \b        backspace
      \c        suppress further output
      \e        escape character
      \f        form feed
      \n        new line
      \r        carriage return
      \t        horizontal tab
      \v        vertical tab
      \\        backslash
      \0nnn     the character whose ASCII code is NNN (octal).  NNN can be
        0 to 3 octal digits
      \xHH      the eight-bit character whose value is HH (hexadecimal).  HH
        can be one or two hex digits

Regards,
Petteri