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select nth file & range of files

 
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# 1  
Old 09-23-2010
select nth file & range of files
Two related questions;

1. how do i select the nth file in a directory?
2. how do i select a range of files, say 2nd-5th?

I have done the following but I don't think the solution is a neat one.

Query 1: select nth file - say 3rd file;

Code:
#!/bin/bash
touch foo1 foo2 foo3 foo4 foo5 foo6
f0=`ls foo*`
f1=($f0)
f3=${f1[2]}
echo $f3 # this selects foo3

Query 2: select range of files, say 2nd to 5th file

Code:
> touch foo1 foo2 foo3 foo4 foo5 foo6
> ls foo* | head -5 | tail -4

Are there alternatives to my solution?

Thanks.
# 2  
Old 09-23-2010
Code:
  1 #!/bin/bash
  2 
  3 if [ $# -ne 3 ];then
  4                    echo "Usage: $0 num1 num2 dir"
  5                    exit 1
  6 fi
  7 ls -1 $3 |sed -n "$1,$2p"
  8 exit 0
  9

name it with "range.sh"
examples:
range.sh 2 2 / : to list the 2nd file of /
range.sh 2 8 ./: to list the 2nd to 8th files of ./


The code is rough. For example, it doesn't check valid numbers. you shoud make it strong by adding some condition tests in case of need.
Last edited by vistastar; 09-23-2010 at 02:50 AM..
This User Gave Thanks to vistastar For This Post:
Muhammad Rahiz
 
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