Programming Forums > Script Programming > Bash / Shell Scripting

Silicon_Pudding · Feb 16th, 2007, 9:57 AM

what is the best method for reading in arguments? How do you guys usually do it?

For example if I had stuff like -r 432 -t -i 5435 etc.

Arevos · Feb 16th, 2007, 10:37 AM

Are you using Bash?

Silicon_Pudding · Feb 17th, 2007, 11:19 AM

yes. i'm using bash.

I want to read in multiple arguments of unknown length.

I found one way that uses a loop with the argument count $#, then uses a case statement to evaluate $1, and then shifts the arguments over to look at the next one.

I was just wondering if there were other methods.

Serinth · Feb 17th, 2007, 12:22 PM

You should look up GETOPTS in the advanced bash scripting guide.

Silicon_Pudding · Feb 17th, 2007, 12:30 PM

Quote:

Originally Posted by Serinth

You should look up GETOPTS in the advanced bash scripting guide.

Thanks, this is exactly what I was looking for.

a thing · Feb 21st, 2007, 12:12 AM

getopts isn't very powerful. Take a look at how prefix (specifically sections 2 through 4) parses arguments. If you want another example, look at fsize.

Note this system is imperfect. Most notibly it doesn't yet support non-option arguments that start with a hyphen. I'll get to this when I have time (a lot of stuff builds up to read after being away over a three day weekend...).

I should make a shell based off Bash that incorporates this system in a builtin...

a thing · Feb 23rd, 2007, 9:22 PM

Okay, I've updated fszie to handle files that start with a hyphen (you have to put -- first to tell it to stop parsing options).

Feb 16th, 2007, 9:57 AM	#1
Silicon_Pudding Newbie Join Date: Jun 2006 Location: In a box Posts: 27 Rep Power: 0	what is the best method for reading in arguments? what is the best method for reading in arguments? How do you guys usually do it? For example if I had stuff like -r 432 -t -i 5435 etc. __________________ ~ Silicon Enhanced Pudding "It's magically delicious"

Feb 17th, 2007, 11:19 AM	#3
Silicon_Pudding Newbie Join Date: Jun 2006 Location: In a box Posts: 27 Rep Power: 0	yes. i'm using bash. I want to read in multiple arguments of unknown length. I found one way that uses a loop with the argument count $#, then uses a case statement to evaluate $1, and then shifts the arguments over to look at the next one. I was just wondering if there were other methods. __________________ ~ Silicon Enhanced Pudding "It's magically delicious"

Feb 17th, 2007, 12:22 PM	#4
Serinth Programmer Join Date: Sep 2005 Posts: 50 Rep Power: 3	You should look up GETOPTS in the advanced bash scripting guide. __________________ A girl talked to me once. http://www.latestanime.com

Feb 21st, 2007, 12:12 AM	#6
a thing Unverified User Join Date: Aug 2005 Location: none Posts: 146 Rep Power: 0	getopts isn't very powerful. Take a look at how prefix (specifically sections 2 through 4) parses arguments. If you want another example, look at fsize. Note this system is imperfect. Most notibly it doesn't yet support non-option arguments that start with a hyphen. I'll get to this when I have time (a lot of stuff builds up to read after being away over a three day weekend...). I should make a shell based off Bash that incorporates this system in a builtin... __________________ Warning: My posts may change (dramatically) within the first 15 minutes they're posted. Got 'Nux?�GNU/Linux and other free software support. It's GNU/Linux, not just Linux. Last edited by a thing; Feb 21st, 2007 at 12:31 AM.

Feb 23rd, 2007, 9:22 PM	#7
a thing Unverified User Join Date: Aug 2005 Location: none Posts: 146 Rep Power: 0	Okay, I've updated fszie to handle files that start with a hyphen (you have to put -- first to tell it to stop parsing options). __________________ Warning: My posts may change (dramatically) within the first 15 minutes they're posted. Got 'Nux?�GNU/Linux and other free software support. It's GNU/Linux, not just Linux.

Feb 16th, 2007, 10:37 AM	#2
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 4	Are you using Bash?

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