Shell Programming and Scripting

try this...

$ sed -n 's/^\(1\.05[0-9]*\).*/\1/p' <input_file> | sed "s,^,echo \"scale=25; ,g;s,$, + $q\" | bc,g" | sh (for addition)
1.05997234566427

$ sed -n 's/^\(1\.05[0-9]*\).*/\1/p' <input_file> | sed "s,^,echo \"scale=25; ,g;s,$, - $q\" | bc,g" | sh (for subtraction)
1.05797234566427

Hi Jayan_jay,

when I run one of the commands above I get:

Code:

sed -n 's/^\(1\.05[0-9]*\).*/\1/p' <input_file> | sed "s,^,echo \"scale=25; ,g;s,$, + $q\" | bc,g" | sh

./testshel.sh: line 10: syntax error near unexpected token `|'
./testshel.sh: line 10: ` sed -n 's/^\(1\.05[0-9]*\).*/\1/p' <small.in> | sed -n "s,^,echo \"scale=25; ,g;s,$, + $q\" | bc,g"'

Any idea what am I doing wrong?

is your grep supports -o option, then you can try this command

Code:

 
grep -o "^1.05" filename

i am getting the output.. anyway try the below. might this help u.$ cat test.shq='0.001'sed -n 's/^\(1\.05[0-9]*\).*/\1/p' input_file | sed "s,^,echo \"scale=25; ,g;s,$, - $q\" \| bc,g" | sh$ ./test.sh1.05797234566427$

You could also go with Perl:

Code:

perl -slane 'if (/^1\.05\d*/){$F[0]+=$q;print $F[0]}' -- -q=0.001 file > out.file

Thank you all for your help, but just the example given by 'bartus11' worked for me.

But I really need an working sed version of this.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Jayan_jay, it's really weird that the above command works for you but not for me.

sed -n 's/^\(1\.05[0-9]*\).*/\1/p' <input_file> | sed "s,^,echo \"scale=25; ,g;s,$, + $q\" | bc,g" | sh
This is the code you gave me.

I just copy and paste your code into terminal and just replace <input_file> with <small.in> which is my original file.

What does this ' | sh' at the end of the line actually do?

I am getting this error:
bash: syntax error near unexpected token `|'

But nevertheless, thank you for you help though.

I am just passing the output to the shell (sh) to execute the syntax.Else you just try and assign the content(till before sh) to a variable and then execute it ..q='0.001'variable=`sed -n 's/^\(1\.05[0-9]*\).*/\1/p' j | sed "s,^,echo \"scale=25; ,g;s,$, - $q\" \| bc,g"`eval $variable