topic Re: About the script writing in Operating System - Linux

About the script writing

eric_204 — Wed, 12 Nov 2003 22:07:08 GMT

I have the following report on the shell , how can I cut the field of last two columns and rows ( 49 , 50 , 59 , 60 ) and paste it to other file ? thx

#vi system1.txt
01 02 03 04 05 06 07 08 09 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60

Re: About the script writing

Stuart Browne — Wed, 12 Nov 2003 22:34:30 GMT

awk is your friend.

awk 'END {
printf( "%s, %s, %s, %s\n", PrevOne, PrevTwo, LastOne, LastTwo );
}
{
PrevOne = LastOne;
PrevTwo = LastTwo;
LastOne = $(NF - 1);
LastTwo = $(NF);
}' < system1.txt

Not the most neat/elegant, but it works.

Re: About the script writing

eric_204 — Thu, 13 Nov 2003 00:38:21 GMT

can I simply use the "cut" comamand ? thx

Re: About the script writing

Stuart Browne — Thu, 13 Nov 2003 00:58:24 GMT

You possibly could, if it was always a fixed number of fields, and a fixed number of lines, in combination with 'tail'.

tail --lines=2 system1.txt | cut -f9-10

would be close, but not in the format listed above.

Re: About the script writing

Huc_1 — Thu, 13 Nov 2003 01:31:05 GMT

Very neat..!
had been trying my hand at it when you can out with it...

J-P (0 point for this just a comment, thanks.)

Re: About the script writing

Mark Grant — Thu, 13 Nov 2003 01:40:10 GMT

Actually, that last cut thing doesn't work on Linux. At least not in my version of cut because the defaukt delimiter is a tab.

tail -2 system1.txt | cut -d " " -f 9-10

works for me though.

Re: About the script writing

eric_204 — Thu, 13 Nov 2003 01:52:52 GMT

thx all reply , another question ,
how can i cut this characters "49,50,59,60" from the file "a.txt" and then paste it to another file "b.txt" in a specific position ? thx

$vi b.txt
<----------blank---------->
<--blank->49 50<--blank--->
<--blank->59 60<--blank--->

Re: About the script writing

Mark Grant — Thu, 13 Nov 2003 02:16:25 GMT

eric,

I think we are now moving away from the realm of one liners :)

Could you be a bit more specific about where in the second file you want the number to appear.

Re: About the script writing

eric_204 — Thu, 13 Nov 2003 02:21:19 GMT

hi Mark ,

I just want the characters paste to the third column ( leave the first two column blank ) , how to do it ? thx.

Re: About the script writing

Mark Grant — Thu, 13 Nov 2003 02:28:17 GMT

This works, though it might be better to put it in a script of it's own rather than just running it from the command line

tail -2 a.txt | cut -d " " -f 9-10 | {
echo
while read a
do
echo " $a"
done
echo
} > b.txt

Re: About the script writing

Mark Grant — Thu, 13 Nov 2003 02:31:42 GMT

Actually, the thing I just posted above assumes you are starting with your original system1.txt
file, not just those four numbers.

Re: About the script writing

eric_204 — Thu, 13 Nov 2003 03:34:02 GMT

thx Mark, my second requirement is paste the numbers to the third column , could suggest how to do it ? thx.

Re: About the script writing

Mark Grant — Thu, 13 Nov 2003 03:47:42 GMT

Hi eric,

I think you just need to have an appropriate number of spaces before the $a in this bit

echo "<-spaces-> $a"

Unless I am misunderstanding you.