Sed Question? - Page 3 - Shell Programming and Scripting

drl · #15 02-03-2008

Hi.

OK, let us assume that we can easily get rid of the commas.

Then we are left with one line that contains a list of numbers, each separated from the next by a blank character. We have an arranging program -- sort -- that orders lines. What transformation would get those two ideas together? What do we need to do? ... cheers, drl

Kweekwom · #16 02-03-2008

drl,

Are you saying I need to get each of the numbers into a separate line?

ghostdog74 · #17 02-03-2008

Code:

#!/bin/sh
s="12-13 15-18 23-28 36-38 42-43 53-56 70-72 76 80-86 93-110 119-128"
echo $s | awk '
{
  for (i=1;i<=NF;i++){
    n=split($i,a,"-")
    for (j=a[1];j<=a[n];j++){
        printf  "%d " ,j  
    }
    print ""
  }
}'

output:

Code:

# ./test.sh
12 13
15 16 17 18
23 24 25 26 27 28
36 37 38
42 43
53 54 55 56
70 71 72
76
80 81 82 83 84 85 86
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110
119 120 121 122 123 124 125 126 127 128

drl · #18 02-03-2008

Hi.

Quote:

Originally Posted by Kweekwom

drl,

Are you saying I need to get each of the numbers into a separate line?

Yes, exactly! Then, presumably, you'd want to put them back together again. Here's one way to do that:

Code:

#!/bin/bash3 -

# @(#) user2    Demonstrate eval and tr.

# echo "Input first set of nodes"

# read node1 # This is where you insert the string of numbers
# node1="435-437,476-492 70-72,76,80-86"
node1="435-437 476-492 70-72 76 80-86"

result=`echo $node1 | sed -r -e 's/([0-9]+)-([0-9]+)[ ]*/{\1..\2} /g'`

echo {1..5}

eval echo $result |
tee t1 |
tr '[, ]' '\n' |
tee t2 |
sort -n |
tr '\n' ' '
echo

exit 0

Producing:

Code:

% ./user2
1 2 3 4 5
70 71 72 76 80 81 82 83 84 85 86 435 436 437 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492

The tee allows you to look at the intermediate form of the data. See the man pages for details on the rest. The tr especially often varies from system to system.

That's part of the design of *nix -- put general tools together to solve specific problems.

Best wishes ... cheers, drl

Kweekwom · #19 02-03-2008

Wow drl, that's really cool. It works just as I need it to! I'll definitely delve deeper into those commands so I can understand them better. Thanks so much for your help!

drl · #20 02-03-2008

Hi.

Quote:

Originally Posted by Kweekwom

... Thanks so much for your help!

You're welcome.

If you get a chance, awk, as in the solution that ghostdog74 posted, is worthwhile to learn. It breaks up input lines into fields, which can then be re-arranged, deleted, assigned to, etc. Very useful, and, once you get the idea of:

Code:

  pattern-part { action-part }

you can do a lot with very little work ... cheers, drl

rikxik · #21 02-03-2008

Just for fun:

Code:

$ input="34-40 10-20 4-8"

$ output=$(echo $input |perl -nae '$,=$\=" "; print foreach(sort {$a<=>$b} map( {s/-/../g ; eval $_ } @F))')

$ echo $output
4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 34 35 36 37 38 39 40

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