What does this command do?

dynomite1988 · 08-16-2012, 01:35 PM

Hi there,
I am taking a beginners Linux course and we are using Red Hat version 9 (Shrike). During our last test the professor asked us what this command would do and I was a little stumped on it. Could somebody please tell me in detail what this following command would do?

Trap "rm ~/tmp* 2> /dev/null; exit" 0 1 2 3

If anybody knows where I can learn more about these command could you please tell me? That would be greatly appreciated.
Thank you

pixellany · 08-16-2012, 01:49 PM

Open a terminal and go thru these steps:

man trap
man rm
man exit

Also, look up "redirection"---Google will find it, or you can read about it here:
http://www.tldp.org/LDP/abs/abs-guide.pdf

Celyr · 08-16-2012, 02:23 PM

Quote:

Originally Posted by dynomite1988

Hi there,
I am taking a beginners Linux course and we are using Red Hat version 9 (Shrike). During our last test the professor asked us what this command would do and I was a little stumped on it. Could somebody please tell me in detail what this following command would do?

Trap "rm ~/tmp* 2> /dev/null; exit" 0 1 2 3

If anybody knows where I can learn more about these command could you please tell me? That would be greatly appreciated.
Thank you

Be case sensitive

.
It does:
$ rm ~/tmp* 2> /dev/null
$ exit
When the shell receives either signal 0 1 2 3, tell your teacher that using signal name instead of numbers is a good idea.

suttiwit · 08-16-2012, 09:51 PM

Linux command-line is case-sensitive so case matters. (Rm = Invalid, rm = valid.)
You can look in the man page and if you need any other help about it feel free to contact me.