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May 19, 2015 - A Look At The New Commandlinefu
I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management
I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

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Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

find all minimum values in file with at least 100 lines

Terminal - find all minimum values in file with at least 100 lines
for ff in directory; do numLines=`wc -l $ff`; numLines=$(echo $numLines | sed 's/ .*//g'); min=$(sort -nrk 1 $ff | tail -1); if [ $numLines -gt 100 ]; then echo $min >> minValues; fi;done;
2013-09-23 04:04:52
User: user1234
Functions: echo sed sort tail
find all minimum values in file with at least 100 lines


There are 2 alternatives - vote for the best!

Terminal - Alternatives

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What others think

Hmm... This could do with some tidying up.

First, I'd replace `wc -l $ff` with $(wc -l $ff)

It uses one more character, but $(...) can be nested and `...` cannot.

It's tempting to fold the two numLine assignments:

numLines=$(wc -l $ff | sed 's/ .*//g')

but I'd prefer to use bash and get rid of sed:

numLines=$(wc -l $ff) numLines=${numLines% *}

To save time, it's better to check the file length FIRST.

Currently, you sort all the small files, then ignore the result:

[ $numLines -lt 100 ] && continue

Now, you don't need the min variable any more:

sort -nrk 1 $ff | tail -1 >> minValues

Next, I'd change that sort line again.

Currently, it writes to 'minValues' one line at a time.

If you've got a LOT of files, it'd be more efficient to do:

sort -nrk 1 $ff | tail -1 done >> minValues

Finally, I'd quote the "$ff" just in case the filenames have whitespace in them.

for ff in directory/*; do numLines=$(wc -l "$ff"); numLines=${numLines% *}; [ $numLines -lt 100 ] && continue; sort -nrk 1 "$ff" | tail -1; done >> minValues

188 characters down to 157 :-)

Minimising it fully:

for f in directory/*;do n=$(wc -l "$f");n=${n% *};[ $n -lt 100 ]&&continue;sort -nrk 1 "$f"|tail -1;done>>minValues

115 characters

Comment by flatcap 161 weeks and 3 days ago

And... :-)

Swap &&continue;sort for ||sort

for f in directory/*;do n=$(wc -l "$f");n=${n% *};[ $n -lt 100 ]||sort -nrk 1 "$f"|tail -1;done>>minValues

106 characters

Comment by flatcap 161 weeks and 3 days ago


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Comment by shoesus53 161 weeks and 2 days ago

Your point of view

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