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issues with bash commands as variables (monero.town)

submitted 1 year ago* (last edited 1 year ago) by shortwavesurfer@monero.town to c/programming

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Any ideas? I am attempting to write a script that uses sed.

If done this way it fails

rmdec="sed 's/..................$//'"
i1xmr=$(echo "$i1p/$apiresponse*1000" |bc -l |$rmdec)

But if i do it this way it works

i1xmr=$(echo "$i1p/$apiresponse*1000" |bc -l | sed 's/..................$//')

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[–] bizdelnick@lemmy.ml 1 points 1 year ago* (last edited 1 year ago) (1 children)

Again, you don't need sed for this, simply set scale=2 or how many digits after decimal point you need. Also you missed ! in the shebang (#!/bin/bash or #!/bin/sh).

[–] shortwavesurfer@monero.town 1 points 1 year ago (1 children)

So I need five digits after the decimal point, but then when I do the multiplication, I only want four digits in total. I did move "scale=" to five and that made the sed command in rmdec much shorter, but its still needed. I thought i could add "length=4" but that throws an error.

[–] bizdelnick@lemmy.ml 1 points 1 year ago (1 children)

Multiply before you divide to keep precision: 1000 * $i1p / $apiresponse

[–] shortwavesurfer@monero.town 1 points 1 year ago

Ah, that did the trick. Thanks