CODEWITHSUNDEEP
linuxterminalgrep
FlyBob
FlyBob

Reputation: 69

Grep number extraction

I need to extract the numerical value, using grep, from a series of lines with this format: "The total difference is: 11.7423485766".

Here the format of the file

smoothSolver:  Solving for Uax, Initial residual = 0.00117823324374, Final residual = 2.6551659504e-06, No Iterations 4

smoothSolver:  Solving for Uay, Initial residual = 0.00102460810826, Final residual = 2.27551114222e-06, No Iterations 4

GAMG:  Solving for pa, Initial residual = 0.083060886073, Final residual = 4.42348716834e-05, No Iterations 8

Adjoint continuity errors : sum local = 0.000102057393701, global = -2.79342190934e-05, cumulative = -0.00156476995631

The ratio scalar is 0.00767871345324

The toal volume  is 0.01

The percentage of fluid domain  is 0.767871345324

omegaVol is 1.331

Total Pressure at the inlet: 18.3146365858

Total Pressure at the outlet: 0.533553352625

The total difference is: 17.7810832332

ExecutionTime = 1.05 s

I tried 

grep "The total difference is:" | cut -d' ' -f9   log

but it seems not to work and I don't understand why.

Any idea? Thanks for help

Upvotes: 0

Views: 64

Answers (2)

fancyPants
fancyPants

Reputation: 51928

Dominique's answer is correct. Just for completeness, your error is, that you specify no file for grep. So you enter interactive mode of grep.

When you do it like this it works:

grep "The total difference is:" log | cut -d' ' -f5

P.S.: you were also selecting the wrong field. It's 5, not 9.

Upvotes: 3

Dominique
Dominique

Reputation: 17565

What about this:

grep "The total difference is:" log | grep -o "[0-9.]*"

The first grep takes the entire line, containing the matching text, the second one takes only the digits.

Upvotes: 3

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