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Print arguments with the help of variable

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# 1  
Old 02-20-2011
Question Print arguments with the help of variable
Let's say I want to print the arguments $4 till $#, how can I do this?
$# contains the number of arguments
$@ contain all the arguments as string
What i need is something like
Code:
for i in $4_till_$#; do
#do something with $i
convert $i ~/$output
done

The first 3 arguments are used as options for other things....
Thanks in advance!
# 2  
Old 02-20-2011
Perhaps like: ${@:3:5}
This User Gave Thanks to tornow For This Post:
hakermania
# 3  
Old 02-20-2011
Hey thanks, this worked....!
Can you explain me please what the number 5 represents here?
I mean if I need to take the arguments from $7 and next, should I do
${@:7:5}
?
# 4  
Old 02-20-2011
It means: from-to. It works for all arrays, not only for $@. (not sure about variables, but i think there too).
Code:
 So: ${@:0:1} would be only the first

Code:
${@:3:6} elements of array (arguments in this case) 3,4,5,6

Code:
 ${@:4:7} elements 4,5,6,7

Ups, i am not allowed to post links yet. Go to "wiki bash-hackers org" and search for Substring/Element expansion: Arrays
as far i know
# 5  
Old 02-20-2011
Quote:
Originally Posted by hakermania
Hey thanks, this worked....!
Can you explain me please what the number 5 represents here?
I mean if I need to take the arguments from $7 and next, should I do
${@:7:5}
?
Basically the parameter expansion is ${name : offset : length}. When the parameter name is that of a variable the offset and length are string related, e.g:
Code:
$ str="123andrew789"
$ echo ${str:3:6}
andrew

When it is @ offset and length refer to positional parameters. so
Code:
${@:3:5}

will pick up parameters 3-7 (if that many exist). However
Code:
${@:3}

will pick up all positional parameters after the third.

Andrew
# 6  
Old 02-22-2011
What about getting all the arguments after e.g. the third?
# 7  
Old 02-23-2011
Quote:
Originally Posted by hakermania
What about getting all the arguments after e.g. the third?
Write a test script and see:
Code:
$ cat args
#!/usr/bin/env bash
echo ${#}
echo All: "$@"
echo 3 to 5: ${@:3:3}
echo 2 to $#: ${@:2}
$ bash args a b c d e f g
7
All: a b c d e f g
3 to 5: c d e
2 to 7: b c d e f g
$ bash args a b c d e f g h i j
10
All: a b c d e f g h i j
3 to 5: c d e
2 to 10: b c d e f g h i j

Andrew
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