launch bash without using any letters

"$(- 2>&1)";${_%%:*}

I don't know why anyone would use this, I was just messing around tonight and managed to start bash without using any letters and thought I would share. It's pretty simple, first it tries to execute "-" redirecting stderr to stdout which prints the error "bash: -: command not found" to standard output, then I try to execute "bash: -: command not found" which produces the output "bash: bash: -: command not found: command not found". lastly, (on the other side of the semicolon) I use the underscore environment variable which refers to the last command run ("bash: -: command not found") and take out everything after the first ":" character using brace expressions and your left with "bash"

Sample Output

seth@Laptop:~/Code/deb/tmp$ "$(- 2>&1)";${_%%:*}
bash: bash: -: command not found: command not found
seth@Laptop:~/Code/deb/tmp$ exit
exit
seth@Laptop:~/Code/deb/tmp$

By: LinuxMan

2012-12-29 09:21:09

2 Alternatives + Submit Alt

launch bash without using any letters

ry4an@four:~$ echo $SHLVL 1 ry4an@four:~$ ${0/-/} ry4an@four:~$ echo $SHLVL 2
This is sample output - yours may be different.
7

${0/-/}

ry4an · 2012-12-31 17:43:08 14
launch bash without using any letters

Starts a new shell (in bash/sh, it starts bash/sh). 'man bash' explains: "If arguments remain after option processing, and neither the -c nor the -s option has been supplied, the first argument is assumed to be the name of a file containing shell commands. If bash is invoked in this fashion, $0 is set to the name of the file, and the positional parameters are set to the remaining arguments."
This is sample output - yours may be different.
0

$0

fhtagn · 2013-03-05 22:57:14 5

What Others Think

Curious, but hardly useful, as you need to be in bash. Why would yo need to exec a subshell?

netizen · 614 weeks ago

this doesn't really have a purpose, but it opens the possibility of writing entire scripts without using letters, similar to what was done in this article with javascript: http://patriciopalladino.com/blog/2012/08/09/non-alphanumeric-javascript.html also, you are right, i don't need the subshell around the ${}, I'll fix that right away

LinuxMan · 614 weeks ago

Accidentally i have come across this website and see the details regarding the commands you have Restaurant Loans shared here. You can learn lots of unix commands from here and this one gives information regarding how to launch bash without using any letters. Good to see its alternatives here.

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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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