echo !(bin|sbin)

dongfangxunlei · n00b Joined: 30 Jan 2013 Posts: 40

This command not work in gentoo bash.It said " !: event not found"
What is the problem?

Genone · Posted: Fri Dec 06, 2013 7:23 am Post subject:

Maybe if you'd say what you're trying to do someone could help. Pretty sure it isn't valid bash syntax, so no idea what that command is supposed to do.

lexflex · Posted: Fri Dec 06, 2013 10:03 am Post subject:

! executes the last instance of a command issued with the then used parameters ( it gets this from .bash_history i guess).

!! executes the last command.
( so !ls gives the last instance of ls, which might have been ls, or ls -all ).

However, as Genone said, the command is not a valid command, so you cant re-execute the last instance of that ....

So, indeed, the question is: what do you want to do exactly?

Alex.

EDIT: ok , apparently '!' is some feature of echo in your example, not a command by itself.

dongfangxunlei · n00b Joined: 30 Jan 2013 Posts: 40

In debian ,this will show all files' and directorys' name except bin,sbin.
for example,if current directory has these files: a ,b ,c ,d
when I execute "echo !(a|b)" in debian,it will show c d
I also copy gentoo's bash to debian and run it in debian ,the same problem occur again.So this must be a bug in gentoo's bash.

John R. Graham · Posted: Fri Dec 06, 2013 3:06 pm Post subject:

Could you possibly find the place in the Debian bash man page where this behavior is documented and post it here? Is it at all possible that you're not using bash on Debian?

- John
_________________
I can confirm that I have received between 0 and 499 National Security Letters.

lexflex · Posted: Fri Dec 06, 2013 3:14 pm Post subject:

dongfangxunlei · n00b Joined: 30 Jan 2013 Posts: 40

What a strange day! I found it work again just now.

gentoo@localhost ~ $ cd /
gentoo@localhost / $ which echo
/bin/echo
gentoo@localhost / $ file /bin/echo
/bin/echo: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.16, stripped
gentoo@localhost / $ echo !(bin|sbin)
boot dev etc home lib lib32 lib64 libx32 lost+found media mnt opt proc root run sys tmp usr var
gentoo@localhost / $ ls
bin dev home lib32 libx32 media opt root sbin tmp var
boot etc lib lib64 lost+found mnt proc run sys usr
gentoo@localhost / $

steveL · Posted: Sat Dec 07, 2013 4:54 am Post subject: