Passing options like -l or --word to commands, or parsing them in scripts

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3
votes
1answer
2k views

xmessage over ssh

The following command prints a message over ssh : xmessage Message -display :0 & How does it work? there is no -display option in xmessage's man page.
3
votes
2answers
5k views

How to catch optioned and non optioned arguments correctly?

I want to write a shell script which will take some arguments with some options and print that arguments. Suppose the name of that script is abc.ksh. Usage of that script is - ./abc.ksh -[a ...
14
votes
3answers
3k views

Is there a 'rc' configuration file for grep/egrep? (~/.egreprc?)

I usually do some grep when developing, and there are some extensions that I always don't want to look for (like *.pyc). Is it possible to create a ~/.egreprc or something like that, and put some ...
10
votes
6answers
6k views

Compiling GNU/Linux with -O3 optimization

It's said that compiling GNU tools and Linux kernel with -O3 gcc optimization option will produce weird and funky bugs. Is it true? Has anyone tried it or is it just a hoax?
61
votes
9answers
17k views

How do I delete a file whose name begins with “-” (hyphen a.k.a. dash or minus)?

How do you remove a file whose filename begins with a dash (hyphen or minus) -? I'm ssh'd into a remote OSX server and I have this file in my directory: tohru:~ $ ls -l total 8 -rw-r--r-- 1 me ...
4
votes
2answers
2k views

what is commit=0 for ext4? does mdadm not support it?

I see this in my dmesg log EXT4-fs (md1): re-mounted. Opts: commit=0 EXT4-fs (md2): re-mounted. Opts: commit=0 EXT4-fs (md3): re-mounted. Opts: commit=0 I think that means that dealloc is disabled? ...