[gentoo-user] Bash script inquiry
I'm trying to run a command in a loop. I have a counter device set...the number that the counter generates is supposed to go inside the command in the loop after every successive iteration of the loop. This is all really to get a general idea I've attached a snippet below. FILE=`cat filename.txt` TICK=`cat filename.txt | wc -l' TOCK=0 while [ $TICK != $TOCK ] ; do let $TOCK=$TOCK+1 Var1= `cat FirstWordOfFirstColumnOfFirstLine` (This I actually achieved with sed and awk) Var2=`cat FirstFloatOfFirstLine` (The problem lies here; it's my inability to come up with a way of implementing a variable that changes along with the counter. so that the second time this is run it doesn't do the first line but moved to the second line and the third line and so on...) done exit 0 My file is like so: VariableSys1Sys2Sys3Sys4 Sys5 Dbase1 5.0 4.6 5.6 6. 6 .004
Re: [gentoo-user] Bash script inquiry
On Tuesday 11 August 2009 09:07:31 Richard Marza wrote:
I'm trying to run a command in a loop. I have a counter device set...the
number that the counter generates is supposed to go inside the command in
the loop after every successive iteration of the loop. This is all really
to get a general idea I've attached a snippet below.
FILE=`cat filename.txt`
TICK=`cat filename.txt | wc -l'
TOCK=0
while [ $TICK != $TOCK ] ; do
let $TOCK=$TOCK+1
Var1= `cat FirstWordOfFirstColumnOfFirstLine` (This I actually
achieved with sed and awk)
Var2=`cat FirstFloatOfFirstLine` (The problem lies here; it's
my inability to come up with a way of implementing a variable that changes
along with the counter. so that the second time this is run it doesn't do
the first line but moved to the second line and the third line and so
on...)
I'm not sure I understand what you want, but you can probably reimplement the
whole thing in awk or sed only much more efficiently. To get more help on
that, post a more complete description of the problem and the result you want
to achieve.
If you really want to keep the current logic, you can save the nth line of the
file at iteration n and process it how many times you want:
# line number is in N
nthline=`sed -n $N{p;q;} file.txt`
var1=`echo $nthline | .`
var2=`echo $nthline | .`
Re: [gentoo-user] Bash script inquiry
Richard Marza writes:
FILE=`cat filename.txt`
TICK=`cat filename.txt | wc -l'
TOCK=0
while [ $TICK != $TOCK ] ; do
let $TOCK=$TOCK+1
Or, simpler, as we are using bash: (( TOCK++ ))
Var1= `cat FirstWordOfFirstColumnOfFirstLine` (This I
actually achieved with sed and awk)
Var2=`cat FirstFloatOfFirstLine` (The problem lies here;
it's my inability to come up with a way of implementing a variable that
changes along with the counter. so that the second time this is run it
doesn't do the first line but moved to the second line and the third line
and so on...)
done
exit 0
What should Var1 contain - Dbase1 or the content of the file Dbase1?
What should Var2 contain - 5.0or the content of the file 5.0?
Because you are using cat in the assignment.
If you just need the values in a variable, do it like this:
file=filename.txt
Var1=( $( cat $file | awk '{ print $1 }' ) ) # creates an array variable
Var2=( $( cat $file | awk '{ print $2 }' ) )
The $() notation does the same as backticks, but is more readable. Using
foo=( ... ) will create foo as an array. I assume there is no whitespace in
your data, that is Var1 will never contain something like Dbase 1.
${#va...@]} will contain the number of elements (your $TICK). To access the
5th element (for example), use ${Var1[4]}.
Oh, an please don't hijack threads by replying to an existing one, but start
a new one. This one appears inside the Cloning movie DVDs thread.
And feel free to ask more questions, maybe I got it all wrong.
Wonko
Re: [gentoo-user] Bash script inquiry
- Original Message -
From: Alex Schuster wo...@wonkology.org
To: gentoo-user@lists.gentoo.org
Sent: Tuesday, August 11, 2009 4:59 AM
Subject: Re: [gentoo-user] Bash script inquiry
Richard Marza writes:
FILE=`cat filename.txt`
TICK=`cat filename.txt | wc -l'
TOCK=0
while [ $TICK != $TOCK ] ; do
let $TOCK=$TOCK+1
Or, simpler, as we are using bash: (( TOCK++ ))
Var1= `cat FirstWordOfFirstColumnOfFirstLine` (This I
actually achieved with sed and awk)
Var2=`cat FirstFloatOfFirstLine` (The problem lies here;
it's my inability to come up with a way of implementing a variable that
changes along with the counter. so that the second time this is run it
doesn't do the first line but moved to the second line and the third line
and so on...)
done
exit 0
What should Var1 contain - Dbase1 or the content of the file Dbase1?
What should Var2 contain - 5.0or the content of the file 5.0?
Because you are using cat in the assignment.
If you just need the values in a variable, do it like this:
file=filename.txt
Var1=( $( cat $file | awk '{ print $1 }' ) ) # creates an array variable
Var2=( $( cat $file | awk '{ print $2 }' ) )
The $() notation does the same as backticks, but is more readable. Using
foo=( ... ) will create foo as an array. I assume there is no whitespace
in
your data, that is Var1 will never contain something like Dbase 1.
${#va...@]} will contain the number of elements (your $TICK). To access
the
5th element (for example), use ${Var1[4]}.
Oh, an please don't hijack threads by replying to an existing one, but
start
a new one. This one appears inside the Cloning movie DVDs thread.
And feel free to ask more questions, maybe I got it all wrong.
Wonko
I did not intend to hijack. Next time I will be more cautious. Your
information is useful. I have used awk. The array is very useful here.
Think of the file I'm using as a spreadsheet. The headers(column names) are
on top and the values are below them. Each line has an item with multiple
values under different systems.
Item System1 System3 System4 ...
nio5.05.55.0(these are individual
values. They are nothing more than what they represent. The item (nio) and
the float or integer representing its value under the different
system...It's just a file)
My goal is to take nio and figure out which system has a different price
than the others. So if the script were to run through 200 lines of similar
text it should definitely kick-out: nio has discrepancy in System3; price
5.5 in line 1
Another thing, all systems can have different prices. This must also kick
out. This is really a script to report discrepancies.
Re: [gentoo-user] Bash script inquiry
On Tuesday 11 August 2009 09:07:31 Richard Marza wrote: I'm trying to run a command in a loop. I have a counter device set...the number that the counter generates is supposed to go inside the command in the loop after every successive iteration of the loop. In what sense is this a reply to Neil? Please do not hijack threads. -- Rgds Peter
[gentoo-user] Bash script inquiry (this is a dup: sorry for the hijack)
- Original Message -
From: Alex Schuster wo...@wonkology.org
To: gentoo-user@lists.gentoo.org
Sent: Tuesday, August 11, 2009 4:59 AM
Subject: Re: [gentoo-user] Bash script inquiry
Richard Marza writes:
FILE=`cat filename.txt`
TICK=`cat filename.txt | wc -l'
TOCK=0
while [ $TICK != $TOCK ] ; do
let $TOCK=$TOCK+1
Or, simpler, as we are using bash: (( TOCK++ ))
Var1= `cat FirstWordOfFirstColumnOfFirstLine` (This I
actually achieved with sed and awk)
Var2=`cat FirstFloatOfFirstLine` (The problem lies here;
it's my inability to come up with a way of implementing a variable that
changes along with the counter. so that the second time this is run it
doesn't do the first line but moved to the second line and the third line
and so on...)
done
exit 0
What should Var1 contain - Dbase1 or the content of the file Dbase1?
What should Var2 contain - 5.0or the content of the file 5.0?
Because you are using cat in the assignment.
If you just need the values in a variable, do it like this:
file=filename.txt
Var1=( $( cat $file | awk '{ print $1 }' ) ) # creates an array variable
Var2=( $( cat $file | awk '{ print $2 }' ) )
The $() notation does the same as backticks, but is more readable. Using
foo=( ... ) will create foo as an array. I assume there is no whitespace
in
your data, that is Var1 will never contain something like Dbase 1.
${#va...@]} will contain the number of elements (your $TICK). To access
the
5th element (for example), use ${Var1[4]}.
Oh, an please don't hijack threads by replying to an existing one, but
start
a new one. This one appears inside the Cloning movie DVDs thread.
And feel free to ask more questions, maybe I got it all wrong.
Wonko
I did not intend to hijack. Next time I will be more cautious. Your
information is useful. I have used awk. The array is very useful here.
Think of the file I'm using as a spreadsheet. The headers(column names) are
on top and the values are below them. Each line has an item with multiple
values under different systems.
Item System1 System3 System4 ...
nio5.05.55.0(these are individual
values. They are nothing more than what they represent. The item (nio) and
the float or integer representing its value under the different
system...It's just a file)
My goal is to take nio and figure out which system has a different price
than the others. So if the script were to run through 200 lines of similar
text it should definitely kick-out: nio has discrepancy in System3; price
5.5 in line 1
Another thing, all systems can have different prices. This must also kick
out. This is really a script to report discrepancies.
Hopefully this one does not appear to be hijacked. If it is let me know and
I'll stop the discussion with regards to my inquiry. Thank you.
Re: [gentoo-user] Bash script inquiry
On Tuesday 11 August 2009 10:27:26 Richard Marza wrote:
Think of the file I'm using as a spreadsheet. The headers(column names) are
on top and the values are below them. Each line has an item with multiple
values under different systems.
Item System1 System3 System4 ...
nio5.05.55.0(these are individual
values. They are nothing more than what they represent. The item (nio) and
the float or integer representing its value under the different
system...It's just a file)
My goal is to take nio and figure out which system has a different price
than the others. So if the script were to run through 200 lines of similar
text it should definitely kick-out: nio has discrepancy in System3; price
5.5 in line 1
Another thing, all systems can have different prices. This must also kick
out. This is really a script to report discrepancies.
As I suspected, you can do the whole thing in awk only. Basically, I'm going
to assume you want to report items which don't have all the same values on all
systems. It's easy to spot those, but it might not be as easy to determine
which values are the normal ones and which are the discrepant ones,
especially if for example each system has a different value. You have to
provide additional logic to tell the discrepant values from the others. For
the moment, the script just prints out the lines where all the columns don't
have the same value.
awk 'NR==1{print;next}{for(i=3;i=NF;i++){if($i!=$2){print;break}}}' file.txt
Re: [gentoo-user] Bash script inquiry
- Original Message -
From: Etaoin Shrdlu shr...@unlimitedmail.org
To: gentoo-user@lists.gentoo.org
Sent: Tuesday, August 11, 2009 5:55 AM
Subject: Re: [gentoo-user] Bash script inquiry
On Tuesday 11 August 2009 10:27:26 Richard Marza wrote:
Think of the file I'm using as a spreadsheet. The headers(column names)
are
on top and the values are below them. Each line has an item with multiple
values under different systems.
Item System1 System3 System4 ...
nio5.05.55.0(these are individual
values. They are nothing more than what they represent. The item (nio)
and
the float or integer representing its value under the different
system...It's just a file)
My goal is to take nio and figure out which system has a different
price
than the others. So if the script were to run through 200 lines of
similar
text it should definitely kick-out: nio has discrepancy in System3;
price
5.5 in line 1
Another thing, all systems can have different prices. This must also kick
out. This is really a script to report discrepancies.
As I suspected, you can do the whole thing in awk only. Basically, I'm
going
to assume you want to report items which don't have all the same values on
all
systems. It's easy to spot those, but it might not be as easy to determine
which values are the normal ones and which are the discrepant ones,
especially if for example each system has a different value. You have to
provide additional logic to tell the discrepant values from the others.
For
the moment, the script just prints out the lines where all the columns
don't
have the same value.
awk 'NR==1{print;next}{for(i=3;i=NF;i++){if($i!=$2){print;break}}}'
file.txt
This is great. But it is important that I find which system has a mismatch
for each item. I guess this is where loops and if statements come in. I
believe I have sufficient information. Although, more discussion is welcome.
Thank you all.
Re: [gentoo-user] Bash script inquiry
On Tuesday 11 August 2009 11:17:12 Richard Marza wrote:
For the moment, the script just prints out the lines where all the columns
don't have the same value.
awk 'NR==1{print;next}{for(i=3;i=NF;i++){if($i!=$2){print;break}}}'
file.txt
This is great. But it is important that I find which system has a mismatch
for each item. I guess this is where loops and if statements come in. I
believe I have sufficient information. Although, more discussion is
welcome. Thank you all.
If you have a way to tell regular values from discrepant ones, it's easy to
modify the program to account for that and print only the values of discrepant
columns. One way could be to look for the value that appears most times in a
row, and consider that value normal and all the others discrepant. But again,
you could have two values repeated the same number of times, so that would not
help. That's why it's important to have an unambiguous rule.
