Bash script

Pinkk · 04-02-2013, 12:10 PM

HI

i have this code where i want the mean of words per line of the second half(lines) that contain a word choosen by the user

count=`wc -l < $1`
if [ $count%2 == 0 ]; then
let cnt=$count/2
else
let cnt=$count/2+1
fi

lala=`tail -$cnt $1`
echo "$lala"|grep "$2" | wc -w
echo "$lala" | grep "$2" | wc -l

now my problem is that i need to divide those two outputs instead of "ouputting" them. but i can't assign them to avariable T_T
lala is the second half of lines. $2 is the word given by the user.

Sorry for my bad english!

Thank you ;D

whizje · 04-02-2013, 12:44 PM

I have no idea what you want but you can assign the output of a command to a variable with var=$(command) example T_T=$(echo "$lala" | grep "$2" | wc -l)

grail · 04-02-2013, 12:49 PM

Please also be aware that bash only performs integer operations and truncates (not rounds) anything after the decimal point. This will affect your results.

Pinkk · 04-02-2013, 01:24 PM

Quote:

Originally Posted by whizje

I have no idea what you want but you can assign the output of a command to a variable with var=$(command) example T_T=$(echo "$lala" | grep "$2" | wc -l)

tried it but doesnt work.

here is what i want

#!/bin/bash

count=`wc -l < $1`
if [ $count%2 == 0 ]; then
let cnt=$count/2
else
let cnt=$count/2+1
fi

lala=`tail -$cnt $1`
word=$("$lala"|grep "$2" | wc -w)
lines=$("$lala" | grep "$2" | wc -l)

let tot=$word+$lines
echo $tot

but it gives the No such file or directory on these:
word=$("$lala"|grep "$2" | wc -w)
lines=$("$lala" | grep "$2" | wc -l)

T_T

danielbmartin · 04-02-2013, 02:52 PM

Quote:

Originally Posted by Pinkk

but it gives the No such file or directory on these:
word=$("$lala"|grep "$2" | wc -w)
lines=$("$lala" | grep "$2" | wc -l)

You didn't specify any input file.
This shows lines containing "raven" in the famous Edgar Allen Poe poem...
Note the < /home/daniel/Desktop/LQfiles/raven.txt identifies the input file.

Code:

daniel@daniel-desktop:~$ grep raven < /home/daniel/Desktop/LQfiles/raven.txt
In there stepped a stately raven of the saintly days of yore.
'Though thy crest be shorn and shaven, thou,' I said, 'art sure no craven.
Ghastly grim and ancient raven wandering from the nightly shore -
Quoth the raven, 'Nevermore.'
But the raven, sitting lonely on the placid bust, spoke only,
But the raven still beguiling all my sad soul into smiling,
Quoth the raven, 'Nevermore.'
Quoth the raven, 'Nevermore.'
Quoth the raven, 'Nevermore.'
Quoth the raven, 'Nevermore.'
And the raven, never flitting, still is sitting, still is sitting

Now let's go one step farther.
This counts those lines.

Code:

daniel@daniel-desktop:~$ grep raven < /home/daniel/Desktop/LQfiles/raven.txt |wc -l
11

Continuing this example ...
This stuffs the numeric value 11 into the variable TT.

Code:

daniel@daniel-desktop:~$ TT=$(grep raven < /home/daniel/Desktop/LQfiles/raven.txt |wc -l)

... and this displays the contents of variable TT.

Code:

daniel@daniel-desktop:~$ echo $TT
11

Daniel B. Martin

whizje · 04-02-2013, 03:44 PM

Quote:

word=$("$lala"|grep "$2" | wc -w)
lines=$("$lala" | grep "$2" | wc -l)

You forgot the echo

Code:

word=$(echo "$lala"|grep "$2" | wc -w)
lines=$(echo "$lala" | grep "$2" | wc -l)

Pinkk · 04-03-2013, 01:57 PM

it worked!!!

Thanks very much