Here is what I have:
#!/bin/bash
#create a multiplication table 5 columns 10 rows
echo " Multiplication Table "
echo "-----+-------------------------"
for x in {0..5}
do
for y in {0..10}
do
echo -n "$(( $x * $y )) "
done
echo
echo "-----+--------------------------"
done
This is my Output:
Multiplication Table
-----+-------------------------
0 0 0 0 0 0 0 0 0 0 0
-----+--------------------------
0 1 2 3 4 5 6 7 8 9 10
-----+--------------------------
0 2 4 6 8 10 12 14 16 18 20
-----+--------------------------
0 3 6 9 12 15 18 21 24 27 30
-----+--------------------------
0 4 8 12 16 20 24 28 32 36 40
-----+--------------------------
0 5 10 15 20 25 30 35 40 45 50
-----+--------------------------
This is the Needed Output:
Multiplication Table
----+-------------------------------------
| 0 1 2 3 4
----+-------------------------------------
0 | 0 0 0 0 0
1 | 0 1 2 3 4
2 | 0 2 4 6 8
3 | 0 3 6 9 12
4 | 0 4 8 12 16
5 | 0 5 10 15 20
6 | 0 6 12 18 24
7 | 0 7 14 21 28
8 | 0 8 16 24 32
9 | 0 9 18 27 36
----+-------------------------------------
I've tried to write this many different ways, but I'm struggling with finding a way to format it correctly. The first is pretty close, but I need it to have the sequential numbers being multiplied on the top and left side. I'm not sure how to use, or if I can use, the seq command to achieve this or if there is a better way. I also need to have straight columns and rows with the defining lines setting the table layout, but my looking up the column command hasn't produced the right output.
Here was my final output and code:
#!/bin/bash
#create a multiplication table 5 columns 10 rows
#Create top of the table
echo " Multiplication Table"
echo "----+------------------------------"
#Print the nums at top of table and format dashes
echo -n " |"; printf '\t%d' {0..5}; echo
echo "----+------------------------------"
#for loops to create table nums
for y in {0..9}
do
#Print the side nums and |
echo -n "$y |"
#for loop to create x
for x in {0..5}
do
#Multiply vars, tab for spacing
echo -en "\t$((x*y))"
done
#Print
echo
done
#Print bottom dashes for format
echo "----+------------------------------"
I changed a bit of Armali's code just to make it more appealing to the eye, and the echo was moved to the bottom (out of the loop) so it didn't print as many lines. But again, thank you Armali, as I would've spent a lot more time figuring out exactly how to write that printf code to get the format correct.
I'm not sure how to use, or if I can use, the seq command to achieve this …
seq offers no advantage here over bash's sequence expression combined with printf.
This variant of your script produces (with the usual 8-column tabs) the needed output:
#!/bin/bash
#create a multiplication table 5 columns 10 rows
echo " Multiplication Table"
echo "----+-------------------------------------"
echo -n " |"; printf '\t%d' {0..4}; echo
echo "----+-------------------------------------"
for y in {0..9}
do echo -n "$y |"
for x in {0..4}
do echo -en "\t$((x*y))"
done
echo
echo "----+-------------------------------------"
done
Related
So I have a C program that outputs many numbers. I have to check them all. The problem is, each time I run my program, I need to change seeds. In order to do that, I've been doing it manually and was trying to make a shell script to work around this.
I've tried using sed but couldn't manage to do it.
I'm trying to get the output like this:
a=$(./algorithm < input.txt)
b=$(./algorithm2 < input.txt)
c=$(./algorithm3 < input.txt)
The output of each algorithm program is something like this:
12 13 315
1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5
So the variable a has all this output, and what I need is
variable a to contain this whole string
and variable a1 to contain only the third number, in this case, 315.
Another example:
2 3 712
1 23 15 12 31 23 3 2 5 6 6 1 2 3 5 51 2 3 21
echo $b should give this output:
2 3 712
1 23 15 12 31 23 3 2 5 6 6 1 2 3 5 51 2 3 21
and echo $b1 should give this output:
712
Thanks!
Not exactly what you are asking, but one way to do this would be to store the results of your algorithm in arrays, and then dereference the item of interest. You'd write something like:
a=( $(./algorithm < input.txt) )
b=( $(./algorithm2 < input.txt) )
c=( $(./algorithm3 < input.txt) )
Notice the extra () that encloses the statements. Now, a, b and c are arrays, and you can access the item of interest like ${a[0]} or $a[1].
For your particular case, since you want the 3rd element, that would have index = 2, hence:
a1=${a[2]}
b1=${b[2]}
c1=${c[2]}
Since you are using the Bash shell (see your tags), you can use Bash arrays to easily access the individual fields in your output strings. For example like so:
#!/bin/bash
# Your lines to gather the output:
# a=$(./algorithm < input.txt)
# b=$(./algorithm2 < input.txt)
# c=$(./algorithm3 < input.txt)
# Just to use your example output strings:
a="$(printf "12 13 315 \n 1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5")"
b="$(printf "2 3 712 \n 1 23 15 12 31 23 3 2 5 6 6 1 2 3 5 51 2 3 21")"
# Put the output in arrays.
a_array=($a)
b_array=($b)
# You can access the array elements individually.
# The array index starts from 0.
# (The names a1 and b1 for the third elements were your choice.)
a1="${a_array[2]}"
b1="${b_array[2]}"
# Print output strings.
# (The newlines in $a and $b are gobbled by echo, since they are not quoted.)
echo "Output a:" $a
echo "Output b:" $b
# Print third elements.
echo "3rd from a: $a1"
echo "3rd from b: $b1"
This script outputs
Output a: 12 13 315 1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5
Output b: 2 3 712 1 23 15 12 31 23 3 2 5 6 6 1 2 3 5 51 2 3 21
3rd from a: 315
3rd from b: 712
Explanation:
The trick here is that array constants (literals) in Bash have the form
(<space_separated_list_of_elements>)
for example
(1 2 3 4 a b c nearly_any_string 99)
Any variable that gets such an array assigned, automatically becomes an array variable. In the script above, this is what happens in a_array=($a): Bash expands the $a to the <space_separated_list_of_elements> and reads the whole expression again interpreting it as an array constant.
Individual elements in such arrays can be referenced like variables by using expressions of the form
<array_name>[<idx>]
like a variable name. Therein, <array_name>is the name of the array and <idx> is an integer that references the individual element. For arrays that are represented by array constants, the index counts elements continuously starting from zero. Therefore, in the script, ${a_array[2]} expands to the third element in the array a_array. If the array would have less elements, a_array[2] would be considered unset.
You can output all elements in the array a_array, the corresponding index array, and the number of elements in the array respectively by
echo "${a_array[#]}"
echo "${!a_array[#]}"
echo "${#a_array[#]}"
These commands can be used to track down the fate of the newline: Given the script above, it is still in $a, as can be seen by (watch the quotes)
echo "$a"
which yields
12 13 315
1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5
But the newline did not make it into the array a_array. This is because Bash considers it as part of the whitespace that separates the third and the fourth element in the array assignment. The same applies if there are no extra spaces around the newline, like here:
12 13 315\n1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5
I actually assume that the output of your C program comes in this form.
This will store the full string in a[0] and the individual fields in a[1-N]:
$ tmp=$(printf '12 13 315\n1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5\n')
$ a=( $(printf '_ %s\n' "$tmp") )
$ a[0]="$tmp"
$ echo "${a[0]}"
12 13 315
1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5
$ echo "${a[3]}"
315
Obviously replace $(printf '12 13 315\n1 2 3 4 5 6 7 8 10 2 8 9 1 0 0 2 3 4 5\n') with $(./algorithm < input.txt) in your real code.
Is there a way to find a value's 2 exponential form in bash.
For example if I input 512 it should result output as 9 meaning 2 ^ 9 is 512.
Any help here is immensely appreciated - Thanks
When I read the question, 512 is the input, and 9 is the output. Is is possible what is being asked here is the answer to "log_base_2(512)" which has an answer of "9". If so, then maybe this would help.
$ echo "l(512) / l(2)" | bc -l
9.00000000000000000008
The explanation of the math can be found here:
How do I calculate the log of a number using bc?
Using awk.
$ echo 512 | awk '{print log($1)/log(2)}'
9
Put that into a script (expo.sh):
#!/bin/bash
_num="$1"
expon=$(awk -v a="$_num" 'BEGIN{print log(a)/log(2)}')
if [[ $expon =~ ^[0-9]+\.[0-9]*$ ]]; then # Match floating points
echo "$_num is not an exponent of 2"; # Not exponent if floating point
else
echo "$_num = 2^${expon}"; # print number
fi
Run:
$ ./expo.sh 512
512 = 2^9
$ ./expo.sh 21
21 is not an exponent of 2
A fast way to check a number x is an 2 exponent is to check bitwise and x and x-1 and to exclude 0, x>0
((x>0 && ( x & x-1 ) == 0 )) && echo $x is a 2-exponent
using this algorithm: fast-computing-of-log2-for-64-bit-integers to compute log2
tab32=( 0 9 1 10 13 21 2 29
11 14 16 18 22 25 3 30
8 12 20 28 15 17 24 7
19 27 23 6 26 5 4 31 )
log2_32() {
local value=$1
(( value |= value >> 1 ))
(( value |= value >> 2 ))
(( value |= value >> 4 ))
(( value |= value >> 8 ))
(( value |= value >> 16 ))
log2_32=${tab32[(value * 16#7C4ACDD & 16#ffffffff)>>27]}
}
log2_32 262144
echo "$log2_32"
This is the script which i run to output the raw data of data_tripwire.sh
#!/bin/sh
LOG=/var/log/syslog-ng/svrs/sec2tes1
for count in 6 5 4 3 2 1 0
do
MONTH=`date -d"$count month ago" +"%Y-%m"`
CBS=`bzcat $LOG/$MONTH*.log.bz2|grep 10.55.22.41 |sort|uniq | wc -l`
echo $CBS >> /home/secmgr/attmrms1/data_tripwire1.sh
done
for count in 6 5 4 3 2 1 0
do
MONTH=`date -d"$count month ago" +"%Y-%m"`
GFS=`bzcat $LOG/$MONTH*.log.bz2|grep 10.55.22.31 |sort|uniq | wc -l`
echo $GFS >> /home/secmgr/attmrms1/data_tripwire1.sh
done
for count in 6 5 4 3 2 1 0
do
MONTH=`date -d"$count month ago" +"%Y-%m"`
HR1=`bzcat $LOG/$MONTH*.log.bz2|grep 10.55.10.1 |sort|uniq | wc -l `
echo $HR1 >> /home/secmgr/attmrms1/data_tripwire1.sh
done
for count in 6 5 4 3 2 1 0
do
MONTH=`date -d"$count month ago" +"%Y-%m"`
HR2=`bzcat $LOG/$MONTH*.log.bz2|grep 10.55.21.12 |sort|uniq | wc -l`
echo $HR2 >> /home/secmgr/attmrms1/data_tripwire1.sh
done
for count in 6 5 4 3 2 1 0
do
MONTH=`date -d"$count month ago" +"%Y-%m"`
PAYROLL=`bzcat $LOG/$MONTH*.log.bz2|grep 10.55.21.18 |sort|uniq | wc -l`
echo $PAYROLL >> /home/secmgr/attmrms1/data_tripwire1.sh
done
for count in 6 5 4 3 2 1 0
do
MONTH=`date -d"$count month ago" +"%Y-%m"`
INCV=`bzcat $LOG/$MONTH*.log.bz2|grep 10.55.22.71 |sort|uniq | wc -l`
echo $INCV >> /home/secmgr/attmrms1/data_tripwire1.sh
done
data_tripwire.sh
91
58
54
108
52
18
8
81
103
110
129
137
84
15
14
18
11
17
12
6
1
28
6
14
8
8
0
0
28
24
25
23
21
13
9
4
18
17
18
30
13
3
I want to do the first 6 entries(91,58,54,108,52,18) from the output above. Then it will break out of the loop.After that it will continue for the next 6 entries.Then it will break out of the loop again....
The problem now is that it reads all the 42 numbers without breaking out of the loop.
This is the output of the table
Tripwire
Month CBS GFS HR HR Payroll INCV
cb2db1 gfs2db1 hr2web1 hrm2db1 hrm2db1a incv2svr1
2013-07 85 76 12 28 26 4
2013-08 58 103 18 6 24 18
2013-09 54 110 11 14 25 17
2013-10 108 129 17 8 23 18
2013-11 52 137 12 8 21 30
2013-12 18 84 6 0 13 13
2014-01 8 16 1 0 9 3
The problem now is that it read the total 42 numbers from 85...3
I want to make a loop which run from july till jan for one server.Then it will do the average mean and standard deviation calculation which is already done below.
After that done, it will continue the next cycle of 6 numbers for the next server and it will do the same like initial cycle.Assistance is required for the for loops which has break and continue in it or any simpler.
This is my standard deviation calculation
count=0 # Number of data points; global.
SC=3 # Scale to be used by bc. three decimal places.
E_DATAFILE=90 # Data file error
## ----------------- Set data file ---------------------
if [ ! -z "$1" ] # Specify filename as cmd-line arg?
then
datafile="$1" # ASCII text file,
else #+ one (numerical) data point per line!
datafile=/home/secmgr/attmrms1/data_tripwire1.sh
fi # See example data file, below.
if [ ! -e "$datafile" ]
then
echo "\""$datafile"\" does not exist!"
exit $E_DATAFILE
fi
Calculate the mean
arith_mean ()
{
local rt=0 # Running total.
local am=0 # Arithmetic mean.
local ct=0 # Number of data points.
while read value # Read one data point at a time.
do
rt=$(echo "scale=$SC; $rt + $value" | bc)
(( ct++ ))
done
am=$(echo "scale=$SC; $rt / $ct" | bc)
echo $am; return $ct # This function "returns" TWO values!
# Caution: This little trick will not work if $ct > 255!
# To handle a larger number of data points,
#+ simply comment out the "return $ct" above.
} <"$datafile" # Feed in data file.
sd ()
{
mean1=$1 # Arithmetic mean (passed to function).
n=$2 # How many data points.
sum2=0 # Sum of squared differences ("variance").
avg2=0 # Average of $sum2.
sdev=0 # Standard Deviation.
while read value # Read one line at a time.
do
diff=$(echo "scale=$SC; $mean1 - $value" | bc)
# Difference between arith. mean and data point.
dif2=$(echo "scale=$SC; $diff * $diff" | bc) # Squared.
sum2=$(echo "scale=$SC; $sum2 + $dif2" | bc) # Sum of squares.
done
avg2=$(echo "scale=$SC; $sum2 / $n" | bc) # Avg. of sum of squares.
sdev=$(echo "scale=$SC; sqrt($avg2)" | bc) # Square root =
echo $sdev # Standard Deviation.
} <"$datafile" # Rewinds data file.
Showing the output
mean=$(arith_mean); count=$? # Two returns from function!
std_dev=$(sd $mean $count)
echo
echo "<tr><th>Servers</th><th>"Number of data points in \"$datafile"\"</th> <th>Arithmetic mean (average)</th><th>Standard Deviation</th></tr>" >> $HTML
echo "<tr><td>cb2db1<td>$count<td>$mean<td>$std_dev</tr>" >> $HTML
echo "<tr><td>gfs2db1<td>$count<td>$mean<td>$std_dev</tr>" >> $HTML
echo "<tr><td>hr2web1<td>$count<td>$mean<td>$std_dev</tr>" >> $HTML
echo "<tr><td>hrm2db1<td>$count<td>$mean<td>$std_dev</tr>" >> $HTML
echo "<tr><td>hrm2db1a<td>$count<td>$mean<td>$std_dev</tr>" >> $HTML
echo "<tr><td>incv21svr1<td>$count<td>$mean<td>$std_dev</tr>" >> $HTML
echo
I want to split the input into chunks of six entries each with the arithmetic mean and the sd of the entries 1..6, then of the entries 7..12, then of 13..18 etc.
This is the output of the table i want.
Tripwire
Month CBS GFS HR HR Payroll INCV
cb2db1 gfs2db1 hr2web1 hrm2db1 hrm2db1a incv2svr1
2013-07 85 76 12 28 26 4
2013-08 58 103 18 6 24 18
2013-09 54 110 11 14 25 17
2013-10 108 129 17 8 23 18
2013-11 52 137 12 8 21 30
2013-12 18 84 6 0 13 13
2014-01 8 16 1 0 9 3
*Standard
deviation
(7mths) 31.172 35.559 5.248 8.935 5.799 8.580
* Mean
(7mths) 54.428 94.285 11.142 9.142 20.285 14.714
paste - - - - - - < data_tripwire.sh | while read -a values; do
# values is an array with 6 values
# ${values[0]} .. ${values[5]}
arith_mean "${values[#]}"
done
This means you have to rewrite your function so they don't use read: change
while read value
to
for value in "$#"
#Matt, yes change both functions to iterate over arguments instead of reading from stdin. Then, you will pass the data file (now called "data_tripwire1.sh" (terrible file extension for data, use .txt or .dat)) into paste to reformat the data so that the first 6 values now form the first row. Read the line into the array values (using read -a values) and invoke the functions :
arith_mean () {
local sum=$(IFS=+; echo "$*")
echo "scale=$SC; ($sum)/$#" | bc
}
sd () {
local mean=$1
shift
local sum2=0
for i in "$#"; do
sum2=$(echo "scale=$SC; $sum2 + ($mean-$i)^2" | bc)
done
echo "scale=$SC; sqrt($sum2/$#)"|bc
}
paste - - - - - - < data_tripwire1.sh | while read -a values; do
mean=$(arith_mean "${values[#]}")
sd=$(sd $mean "${values[#]}")
echo "${values[#]} $mean $sd"
done | column -t
91 58 54 108 52 18 63.500 29.038
8 81 103 110 129 137 94.666 42.765
84 15 14 18 11 17 26.500 25.811
12 6 1 28 6 14 11.166 8.648
8 8 0 0 28 24 11.333 10.934
25 23 21 13 9 4 15.833 7.711
18 17 18 30 13 3 16.500 7.973
Note you don't need to return a fancy value from the functions: you know how many points you pass in.
Based on Glenn's answer I propose this which needs very little changes to the original:
paste - - - - - - < data_tripwire.sh | while read -a values
do
for value in "${values[#]}"
do
echo "$value"
done | arith_mean
for value in "${values[#]}"
do
echo "$value"
done | sd
done
You can type (or copy & paste) this code directly in an interactive shell. It should work out of the box. Of course, this is not feasible if you intend to use this often, so you can put that code into a text file, make that executable and call that text file as a shell script. In this case you should add #!/bin/bash as first line in that file.
Credit to Glenn Jackman for the use of paste - - - - - - which is the real solution I'd say.
The functions will now be able to only read 6 items in datafile.
arith_mean ()
{
local rt=0 # Running total.
local am=0 # Arithmetic mean.
local ct=0 # Number of data points.
while read value # Read one data point at a time.
do
rt=$(echo "scale=$SC; $rt + $value" | bc)
(( ct++ ))
done
am=$(echo "scale=$SC; $rt / $ct" | bc)
echo $am; return $ct # This function "returns" TWO values!
# Caution: This little trick will not work if $ct > 255!
# To handle a larger number of data points,
#+ simply comment out the "return $ct" above.
} <(awk -v block=$i 'NR > (6* (block - 1)) && NR < (6 * block + 1) {print}' "$datafile") # Feed in data file.
sd ()
{
mean1=$1 # Arithmetic mean (passed to function).
n=$2 # How many data points.
sum2=0 # Sum of squared differences ("variance").
avg2=0 # Average of $sum2.
sdev=0 # Standard Deviation.
while read value # Read one line at a time.
do
diff=$(echo "scale=$SC; $mean1 - $value" | bc)
# Difference between arith. mean and data point.
dif2=$(echo "scale=$SC; $diff * $diff" | bc) # Squared.
sum2=$(echo "scale=$SC; $sum2 + $dif2" | bc) # Sum of squares.
done
avg2=$(echo "scale=$SC; $sum2 / $n" | bc) # Avg. of sum of squares.
sdev=$(echo "scale=$SC; sqrt($avg2)" | bc) # Square root =
echo $sdev # Standard Deviation.
} <(awk -v block=$i 'NR > (6 * (block - 1)) && NR < (6 * block + 1) {print}' "$datafile") # Rewinds data file.
From main you will need to set your blocks to read.
for((i=1; i <= $(( $(wc -l $datafile | sed 's/[A-Za-z \/]*//g') / 6 )); i++))
do
mean=$(arith_mean); count=$? # Two returns from function!
std_dev=$(sd $mean $count)
done
Of course it is better to move the wc -l outside of the loop for faster execution. But you get the idea.
The syntax error occured between < and ( due to space. There shouldn't be a space between them. Sorry for the typo.
cat <(awk -F: '{print $1}' /etc/passwd) works.
cat < (awk -F: '{print $1}' /etc/passwd) syntax error near unexpected token `('
How can I add 6 more single space separated columns to a file.
The input file that looks like this:
-11.160574
...
-11.549076
-12.020907
...
-12.126601
...
-11.93235
...
-8.297653
Where ... represents 50 more lines of numbers.
The output I want is this:
-11.160574 1 1 1 1 1 14
...
-11.549076 51 51 1 1 1 14
-12.020907 1 1 2 2 1 14
...
-12.126601 51 51 2 2 1 14
...
-11.93235 1 1 51 51 1 14
...
-8.297653 51 51 51 51 1 14
The 2nd and 3rd columns are loops for 1 to 51.
The 4th and 5th columns are also loops for 1 to 51, but at the upper level from above.
The last two ones constants columns of 1 and 14.
Use a loop to read the file line-by-line and maintain counters to keep track of the field numbers as shown below:
#!/bin/bash
field1=1
field2=1
while read line
do
echo "$line $field1 $field1 $field2 $field2 1 14"
(( field1++ ))
if (( $field1 == 52 )); then
field1=1
(( field2++ ))
fi
done < file
Here you go, an awk script:
{
mod = 51
a = (NR - 1) % mod + 1
b = int((NR - 1) / mod) + 1
c = 1
d = 14
print $0,a,a,b,b,c,d
}
Run it with something like awk -f the-script.awk in-file.txt. Or make it executable and add #!/usr/bin/awk -f at the top, and you can run it directly without typing awk -f.
I have a large dataset that looks like this:
5 6 5 6 3 5
2 5 3 7 1 6
4 8 1 8 6 9
1 5 2 9 4 5
For every line, I want to subtract the first field from the second, third from fourth and so on deepening on the number of fields (always even). Then, I want to report those lines for which difference from all the pairs exceeds a certain limit (say 2). I should also be able to report next best lines i.e., lines in which one pairwise comparison fails to meet the limit, but all other pairs meet the limit.
from the above example, if I set a limit to 2 then, my output file should contain
best lines:
2 5 3 7 1 6 # because (5-2), (7-3), (6-1) are all > 2
4 8 1 8 6 9 # because (8-4), (8-1), (9-6) are all > 2
next best line(s)
1 5 2 9 4 5 # because except (5-4), both (5-1) and (9-2) are > 2
My current approach is to read every line, save each field as a variable, do subtraction.
But I don't know how to proceed further.
Thanks,
Prints "best" lines to the file "best", and prints "next best" lines to the file "nextbest"
awk '
{
fail_count=0
for (i=1; i<NF; i+=2){
if ( ($(i+1) - $i) <= threshold )
fail_count++
}
if (fail_count == 0)
print $0 > "best"
else if (fail_count == 1)
print $0 > "nextbest"
}
' threshold=2 inputfile
Pretty straightforward stuff.
Loop through fields 2 at a time.
If (next field - current field) does not exceed threshold, increment fail_count
If that line's fail_count is zero, that means it belongs to "best" lines.
Else if that line's fail_count is one, it belongs to "next best" lines.
Here's a bash-way to do it:
#!/bin/bash
threshold=$1
shift
file="$#"
a=($(cat "$file"))
b=$(( ${#a[#]}/$(cat "$file" | wc -l) ))
for ((r=0; r<${#a[#]}/b; r++)); do
br=$((b*r))
for ((c=0; c<b; c+=2)); do
if [[ $(( ${a[br + c+1]} - ${a[br + c]} )) < $threshold ]]; then
break; fi
if [[ $((c+2)) == $b ]]; then
echo ${a[#]:$br:$b}; fi
done
done
Usage:
$ ./script.sh 2 yourFile.txt
2 5 3 7 1 6
4 8 1 8 6 9
This output can then easily be redirected:
$ ./script.sh 2 yourFile.txt > output.txt
NOTE: this does not work properly if you have those empty lines between each line...But I'm sure the above will get you well on your way.
I probably wouldn't do that in bash. Personally, I'd do it in Python, which is generally good for those small quick-and-dirty scripts.
If you have your data in a text file, you can read here about how to get that data into Python as a list of lines. Then you can use a for-loop to process each line:
threshold = 2
results = []
for line in content:
numbers = [int(n) for n in line.split()] # Split it into a list of numbers
pairs = zip(numbers[::2],numbers[1::2]) # Pair up the numbers two and two.
result = [abs(y - x) for (x,y) in pairs] # Subtract the first number in each pair from the second.
if sum(result) > threshold:
results.append(numbers)
Yet another bash version:
First a check function that return nothing but a result code:
function getLimit() {
local pairs=0 count=0 limit=$1 wantdiff=$2
shift 2
while [ "$1" ] ;do
[ $(( $2-$1 )) -ge $limit ] && : $((count++))
: $((pairs++))
shift 2
done
test $((pairs-count)) -eq $wantdiff
}
than now:
while read line ;do getLimit 2 0 $line && echo $line;done <file
2 5 3 7 1 6
4 8 1 8 6 9
and
while read line ;do getLimit 2 1 $line && echo $line;done <file
1 5 2 9 4 5
If you can use awk
$ cat del1
5 6 5 6 3 5
2 5 3 7 1 6
4 8 1 8 6 9
1 5 2 9 4 5
1 5 2 9 4 5 3 9
$ cat del1 | awk '{
> printf "%s _ ",$0;
> for(i=1; i<=NF; i+=2){
> printf "%d ",($(i+1)-$i)};
> print NF
> }' | awk '{
> upper=0;
> for(i=1; i<=($NF/2); i++){
> if($(NF-i)>threshold) upper++
> };
> printf "%d _ %s\n", upper, $0}' threshold=2 | sort -nr
3 _ 4 8 1 8 6 9 _ 4 7 3 6
3 _ 2 5 3 7 1 6 _ 3 4 5 6
3 _ 1 5 2 9 4 5 3 9 _ 4 7 1 6 8
2 _ 1 5 2 9 4 5 _ 4 7 1 6
0 _ 5 6 5 6 3 5 _ 1 1 2 6
You can process result further according to your needs. The result is sorted by ‘goodness’ order.